delete tree_builder, driver and serialize

17 files changed, 0 insertions, 4647 deletions

diff --git a/Cargo.toml b/Cargo.toml
index d8bacd4..34617f6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,7 +7,6 @@ license = "MIT / Apache-2.0"
 repository = "https://github.com/servo/html5ever"
 description = "High-performance browser-grade HTML5 parser"
 documentation = "https://docs.rs/html5ever"
-build = "build.rs"
 categories = [ "parser-implementations", "web-programming" ]
 edition = "2018"
 
diff --git a/build.rs b/build.rs
deleted file mode 100644
index bfac771..0000000
--- a/build.rs
+++ /dev/null
@@ -1,33 +0,0 @@
-// Copyright 2014-2017  The html5ever Project Developers. See the
-// COPYRIGHT file at the top-level directory of this distribution.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-use std::env;
-use std::path::Path;
-use std::thread::Builder;
-
-#[path = "macros/match_token.rs"]
-mod match_token;
-
-fn main() {
-    let manifest_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
-
-    let input = Path::new(&manifest_dir).join("src/tree_builder/rules.rs");
-    let output = Path::new(&env::var("OUT_DIR").unwrap()).join("rules.rs");
-    println!("cargo:rerun-if-changed={}", input.display());
-
-    // We have stack overflows on Servo's CI.
-    let handle = Builder::new()
-        .stack_size(128 * 1024 * 1024)
-        .spawn(move || {
-            match_token::expand(&input, &output);
-        })
-        .unwrap();
-
-    handle.join().unwrap();
-}
diff --git a/examples/arena.rs b/examples/arena.rs
deleted file mode 100644
index 1b59ae1..0000000
--- a/examples/arena.rs
+++ /dev/null
@@ -1,335 +0,0 @@
-// Copyright 2014-2017 The html5ever Project Developers. See the
-// COPYRIGHT file at the top-level directory of this distribution.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-extern crate html5ever;
-extern crate typed_arena;
-
-use html5ever::interface::tree_builder::{ElementFlags, NodeOrText, QuirksMode, TreeSink};
-use html5ever::tendril::{StrTendril, TendrilSink};
-use html5ever::{parse_document, Attribute, ExpandedName, QualName};
-use std::borrow::Cow;
-use std::cell::{Cell, RefCell};
-use std::collections::HashSet;
-use std::io::{self, Read};
-use std::ptr;
-
-fn main() {
-    let mut bytes = Vec::new();
-    io::stdin().read_to_end(&mut bytes).unwrap();
-    let arena = typed_arena::Arena::new();
-    html5ever_parse_slice_into_arena(&bytes, &arena);
-}
-
-fn html5ever_parse_slice_into_arena<'a>(bytes: &[u8], arena: Arena<'a>) -> Ref<'a> {
-    let sink = Sink {
-        arena: arena,
-        document: arena.alloc(Node::new(NodeData::Document)),
-        quirks_mode: QuirksMode::NoQuirks,
-    };
-    parse_document(sink, Default::default())
-        .from_utf8()
-        .one(bytes)
-}
-
-type Arena<'arena> = &'arena typed_arena::Arena<Node<'arena>>;
-
-type Ref<'arena> = &'arena Node<'arena>;
-
-type Link<'arena> = Cell<Option<Ref<'arena>>>;
-
-struct Sink<'arena> {
-    arena: Arena<'arena>,
-    document: Ref<'arena>,
-    quirks_mode: QuirksMode,
-}
-
-pub struct Node<'arena> {
-    parent: Link<'arena>,
-    next_sibling: Link<'arena>,
-    previous_sibling: Link<'arena>,
-    first_child: Link<'arena>,
-    last_child: Link<'arena>,
-    data: NodeData<'arena>,
-}
-
-pub enum NodeData<'arena> {
-    Document,
-    Doctype {
-        name: StrTendril,
-        public_id: StrTendril,
-        system_id: StrTendril,
-    },
-    Text {
-        contents: RefCell<StrTendril>,
-    },
-    Comment {
-        contents: StrTendril,
-    },
-    Element {
-        name: QualName,
-        attrs: RefCell<Vec<Attribute>>,
-        template_contents: Option<Ref<'arena>>,
-        mathml_annotation_xml_integration_point: bool,
-    },
-    ProcessingInstruction {
-        target: StrTendril,
-        contents: StrTendril,
-    },
-}
-
-impl<'arena> Node<'arena> {
-    fn new(data: NodeData<'arena>) -> Self {
-        Node {
-            parent: Cell::new(None),
-            previous_sibling: Cell::new(None),
-            next_sibling: Cell::new(None),
-            first_child: Cell::new(None),
-            last_child: Cell::new(None),
-            data: data,
-        }
-    }
-
-    fn detach(&self) {
-        let parent = self.parent.take();
-        let previous_sibling = self.previous_sibling.take();
-        let next_sibling = self.next_sibling.take();
-
-        if let Some(next_sibling) = next_sibling {
-            next_sibling.previous_sibling.set(previous_sibling);
-        } else if let Some(parent) = parent {
-            parent.last_child.set(previous_sibling);
-        }
-
-        if let Some(previous_sibling) = previous_sibling {
-            previous_sibling.next_sibling.set(next_sibling);
-        } else if let Some(parent) = parent {
-            parent.first_child.set(next_sibling);
-        }
-    }
-
-    fn append(&'arena self, new_child: &'arena Self) {
-        new_child.detach();
-        new_child.parent.set(Some(self));
-        if let Some(last_child) = self.last_child.take() {
-            new_child.previous_sibling.set(Some(last_child));
-            debug_assert!(last_child.next_sibling.get().is_none());
-            last_child.next_sibling.set(Some(new_child));
-        } else {
-            debug_assert!(self.first_child.get().is_none());
-            self.first_child.set(Some(new_child));
-        }
-        self.last_child.set(Some(new_child));
-    }
-
-    fn insert_before(&'arena self, new_sibling: &'arena Self) {
-        new_sibling.detach();
-        new_sibling.parent.set(self.parent.get());
-        new_sibling.next_sibling.set(Some(self));
-        if let Some(previous_sibling) = self.previous_sibling.take() {
-            new_sibling.previous_sibling.set(Some(previous_sibling));
-            debug_assert!(ptr::eq::<Node>(
-                previous_sibling.next_sibling.get().unwrap(),
-                self
-            ));
-            previous_sibling.next_sibling.set(Some(new_sibling));
-        } else if let Some(parent) = self.parent.get() {
-            debug_assert!(ptr::eq::<Node>(parent.first_child.get().unwrap(), self));
-            parent.first_child.set(Some(new_sibling));
-        }
-        self.previous_sibling.set(Some(new_sibling));
-    }
-}
-
-impl<'arena> Sink<'arena> {
-    fn new_node(&self, data: NodeData<'arena>) -> Ref<'arena> {
-        self.arena.alloc(Node::new(data))
-    }
-
-    fn append_common<P, A>(&self, child: NodeOrText<Ref<'arena>>, previous: P, append: A)
-    where
-        P: FnOnce() -> Option<Ref<'arena>>,
-        A: FnOnce(Ref<'arena>),
-    {
-        let new_node = match child {
-            NodeOrText::AppendText(text) => {
-                // Append to an existing Text node if we have one.
-                if let Some(&Node {
-                    data: NodeData::Text { ref contents },
-                    ..
-                }) = previous()
-                {
-                    contents.borrow_mut().push_tendril(&text);
-                    return;
-                }
-                self.new_node(NodeData::Text {
-                    contents: RefCell::new(text),
-                })
-            },
-            NodeOrText::AppendNode(node) => node,
-        };
-
-        append(new_node)
-    }
-}
-
-impl<'arena> TreeSink for Sink<'arena> {
-    type Handle = Ref<'arena>;
-    type Output = Ref<'arena>;
-
-    fn finish(self) -> Ref<'arena> {
-        self.document
-    }
-
-    fn parse_error(&mut self, _: Cow<'static, str>) {}
-
-    fn get_document(&mut self) -> Ref<'arena> {
-        self.document
-    }
-
-    fn set_quirks_mode(&mut self, mode: QuirksMode) {
-        self.quirks_mode = mode;
-    }
-
-    fn same_node(&self, x: &Ref<'arena>, y: &Ref<'arena>) -> bool {
-        ptr::eq::<Node>(*x, *y)
-    }
-
-    fn elem_name<'a>(&self, target: &'a Ref<'arena>) -> ExpandedName<'a> {
-        match target.data {
-            NodeData::Element { ref name, .. } => name.expanded(),
-            _ => panic!("not an element!"),
-        }
-    }
-
-    fn get_template_contents(&mut self, target: &Ref<'arena>) -> Ref<'arena> {
-        if let NodeData::Element {
-            template_contents: Some(ref contents),
-            ..
-        } = target.data
-        {
-            contents
-        } else {
-            panic!("not a template element!")
-        }
-    }
-
-    fn is_mathml_annotation_xml_integration_point(&self, target: &Ref<'arena>) -> bool {
-        if let NodeData::Element {
-            mathml_annotation_xml_integration_point,
-            ..
-        } = target.data
-        {
-            mathml_annotation_xml_integration_point
-        } else {
-            panic!("not an element!")
-        }
-    }
-
-    fn create_element(
-        &mut self,
-        name: QualName,
-        attrs: Vec<Attribute>,
-        flags: ElementFlags,
-    ) -> Ref<'arena> {
-        self.new_node(NodeData::Element {
-            name,
-            attrs: RefCell::new(attrs),
-            template_contents: if flags.template {
-                Some(self.new_node(NodeData::Document))
-            } else {
-                None
-            },
-            mathml_annotation_xml_integration_point: flags.mathml_annotation_xml_integration_point,
-        })
-    }
-
-    fn create_comment(&mut self, text: StrTendril) -> Ref<'arena> {
-        self.new_node(NodeData::Comment { contents: text })
-    }
-
-    fn create_pi(&mut self, target: StrTendril, data: StrTendril) -> Ref<'arena> {
-        self.new_node(NodeData::ProcessingInstruction {
-            target: target,
-            contents: data,
-        })
-    }
-
-    fn append(&mut self, parent: &Ref<'arena>, child: NodeOrText<Ref<'arena>>) {
-        self.append_common(
-            child,
-            || parent.last_child.get(),
-            |new_node| parent.append(new_node),
-        )
-    }
-
-    fn append_before_sibling(&mut self, sibling: &Ref<'arena>, child: NodeOrText<Ref<'arena>>) {
-        self.append_common(
-            child,
-            || sibling.previous_sibling.get(),
-            |new_node| sibling.insert_before(new_node),
-        )
-    }
-
-    fn append_based_on_parent_node(
-        &mut self,
-        element: &Ref<'arena>,
-        prev_element: &Ref<'arena>,
-        child: NodeOrText<Ref<'arena>>,
-    ) {
-        if element.parent.get().is_some() {
-            self.append_before_sibling(element, child)
-        } else {
-            self.append(prev_element, child)
-        }
-    }
-
-    fn append_doctype_to_document(
-        &mut self,
-        name: StrTendril,
-        public_id: StrTendril,
-        system_id: StrTendril,
-    ) {
-        self.document.append(self.new_node(NodeData::Doctype {
-            name,
-            public_id,
-            system_id,
-        }))
-    }
-
-    fn add_attrs_if_missing(&mut self, target: &Ref<'arena>, attrs: Vec<Attribute>) {
-        let mut existing = if let NodeData::Element { ref attrs, .. } = target.data {
-            attrs.borrow_mut()
-        } else {
-            panic!("not an element")
-        };
-
-        let existing_names = existing
-            .iter()
-            .map(|e| e.name.clone())
-            .collect::<HashSet<_>>();
-        existing.extend(
-            attrs
-                .into_iter()
-                .filter(|attr| !existing_names.contains(&attr.name)),
-        );
-    }
-
-    fn remove_from_parent(&mut self, target: &Ref<'arena>) {
-        target.detach()
-    }
-
-    fn reparent_children(&mut self, node: &Ref<'arena>, new_parent: &Ref<'arena>) {
-        let mut next_child = node.first_child.get();
-        while let Some(child) = next_child {
-            debug_assert!(ptr::eq::<Node>(child.parent.get().unwrap(), *node));
-            next_child = child.next_sibling.get();
-            new_parent.append(child)
-        }
-    }
-}
diff --git a/examples/noop-tree-builder.rs b/examples/noop-tree-builder.rs
deleted file mode 100644
index 0775449..0000000
--- a/examples/noop-tree-builder.rs
+++ /dev/null
@@ -1,112 +0,0 @@
-// Copyright 2014-2017 The html5ever Project Developers. See the
-// COPYRIGHT file at the top-level directory of this distribution.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-#[macro_use]
-extern crate html5ever;
-
-use std::borrow::Cow;
-use std::collections::HashMap;
-use std::default::Default;
-use std::io;
-
-use html5ever::parse_document;
-use html5ever::tendril::*;
-use html5ever::tree_builder::{ElementFlags, NodeOrText, QuirksMode, TreeSink};
-use html5ever::{Attribute, ExpandedName, QualName};
-
-struct Sink {
-    next_id: usize,
-    names: HashMap<usize, QualName>,
-}
-
-impl Sink {
-    fn get_id(&mut self) -> usize {
-        let id = self.next_id;
-        self.next_id += 2;
-        id
-    }
-}
-
-impl TreeSink for Sink {
-    type Handle = usize;
-    type Output = Self;
-    fn finish(self) -> Self {
-        self
-    }
-
-    fn get_document(&mut self) -> usize {
-        0
-    }
-
-    fn get_template_contents(&mut self, target: &usize) -> usize {
-        if let Some(expanded_name!(html "template")) = self.names.get(&target).map(|n| n.expanded())
-        {
-            target + 1
-        } else {
-            panic!("not a template element")
-        }
-    }
-
-    fn same_node(&self, x: &usize, y: &usize) -> bool {
-        x == y
-    }
-
-    fn elem_name(&self, target: &usize) -> ExpandedName {
-        self.names.get(target).expect("not an element").expanded()
-    }
-
-    fn create_element(&mut self, name: QualName, _: Vec<Attribute>, _: ElementFlags) -> usize {
-        let id = self.get_id();
-        self.names.insert(id, name);
-        id
-    }
-
-    fn create_comment(&mut self, _text: StrTendril) -> usize {
-        self.get_id()
-    }
-
-    #[allow(unused_variables)]
-    fn create_pi(&mut self, target: StrTendril, value: StrTendril) -> usize {
-        unimplemented!()
-    }
-
-    fn append_before_sibling(&mut self, _sibling: &usize, _new_node: NodeOrText<usize>) {}
-
-    fn append_based_on_parent_node(
-        &mut self,
-        _element: &usize,
-        _prev_element: &usize,
-        _new_node: NodeOrText<usize>,
-    ) {
-    }
-
-    fn parse_error(&mut self, _msg: Cow<'static, str>) {}
-    fn set_quirks_mode(&mut self, _mode: QuirksMode) {}
-    fn append(&mut self, _parent: &usize, _child: NodeOrText<usize>) {}
-
-    fn append_doctype_to_document(&mut self, _: StrTendril, _: StrTendril, _: StrTendril) {}
-    fn add_attrs_if_missing(&mut self, target: &usize, _attrs: Vec<Attribute>) {
-        assert!(self.names.contains_key(&target), "not an element");
-    }
-    fn remove_from_parent(&mut self, _target: &usize) {}
-    fn reparent_children(&mut self, _node: &usize, _new_parent: &usize) {}
-    fn mark_script_already_started(&mut self, _node: &usize) {}
-}
-
-fn main() {
-    let sink = Sink {
-        next_id: 1,
-        names: HashMap::new(),
-    };
-    let stdin = io::stdin();
-    parse_document(sink, Default::default())
-        .from_utf8()
-        .read_from(&mut stdin.lock())
-        .unwrap();
-}
diff --git a/examples/print-tree-actions.rs b/examples/print-tree-actions.rs
deleted file mode 100644
index dbb6c6e..0000000
--- a/examples/print-tree-actions.rs
+++ /dev/null
@@ -1,177 +0,0 @@
-// Copyright 2014-2017 The html5ever Project Developers. See the
-// COPYRIGHT file at the top-level directory of this distribution.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-#[macro_use]
-extern crate html5ever;
-
-use std::borrow::Cow;
-use std::collections::HashMap;
-use std::default::Default;
-use std::io;
-
-use html5ever::parse_document;
-use html5ever::tendril::*;
-use html5ever::tree_builder::{
-    AppendNode, AppendText, ElementFlags, NodeOrText, QuirksMode, TreeSink,
-};
-use html5ever::{Attribute, ExpandedName, QualName};
-
-struct Sink {
-    next_id: usize,
-    names: HashMap<usize, QualName>,
-}
-
-impl Sink {
-    fn get_id(&mut self) -> usize {
-        let id = self.next_id;
-        self.next_id += 2;
-        id
-    }
-}
-
-impl TreeSink for Sink {
-    type Handle = usize;
-    type Output = Self;
-    fn finish(self) -> Self {
-        self
-    }
-
-    fn parse_error(&mut self, msg: Cow<'static, str>) {
-        println!("Parse error: {}", msg);
-    }
-
-    fn get_document(&mut self) -> usize {
-        0
-    }
-
-    fn get_template_contents(&mut self, target: &usize) -> usize {
-        if let Some(expanded_name!(html "template")) = self.names.get(target).map(|n| n.expanded())
-        {
-            target + 1
-        } else {
-            panic!("not a template element")
-        }
-    }
-
-    fn set_quirks_mode(&mut self, mode: QuirksMode) {
-        println!("Set quirks mode to {:?}", mode);
-    }
-
-    fn same_node(&self, x: &usize, y: &usize) -> bool {
-        x == y
-    }
-
-    fn elem_name(&self, target: &usize) -> ExpandedName {
-        self.names.get(target).expect("not an element").expanded()
-    }
-
-    fn create_element(&mut self, name: QualName, _: Vec<Attribute>, _: ElementFlags) -> usize {
-        let id = self.get_id();
-        println!("Created {:?} as {}", name, id);
-        self.names.insert(id, name);
-        id
-    }
-
-    fn create_comment(&mut self, text: StrTendril) -> usize {
-        let id = self.get_id();
-        println!("Created comment \"{}\" as {}", escape_default(&text), id);
-        id
-    }
-
-    #[allow(unused_variables)]
-    fn create_pi(&mut self, target: StrTendril, value: StrTendril) -> usize {
-        unimplemented!()
-    }
-
-    fn append(&mut self, parent: &usize, child: NodeOrText<usize>) {
-        match child {
-            AppendNode(n) => println!("Append node {} to {}", n, parent),
-            AppendText(t) => println!("Append text to {}: \"{}\"", parent, escape_default(&t)),
-        }
-    }
-
-    fn append_before_sibling(&mut self, sibling: &usize, new_node: NodeOrText<usize>) {
-        match new_node {
-            AppendNode(n) => println!("Append node {} before {}", n, sibling),
-            AppendText(t) => println!("Append text before {}: \"{}\"", sibling, escape_default(&t)),
-        }
-    }
-
-    fn append_based_on_parent_node(
-        &mut self,
-        element: &Self::Handle,
-        _prev_element: &Self::Handle,
-        child: NodeOrText<Self::Handle>,
-    ) {
-        self.append_before_sibling(element, child);
-    }
-
-    fn append_doctype_to_document(
-        &mut self,
-        name: StrTendril,
-        public_id: StrTendril,
-        system_id: StrTendril,
-    ) {
-        println!("Append doctype: {} {} {}", name, public_id, system_id);
-    }
-
-    fn add_attrs_if_missing(&mut self, target: &usize, attrs: Vec<Attribute>) {
-        assert!(self.names.contains_key(target), "not an element");
-        println!("Add missing attributes to {}:", target);
-        for attr in attrs.into_iter() {
-            println!("    {:?} = {}", attr.name, attr.value);
-        }
-    }
-
-    fn associate_with_form(
-        &mut self,
-        _target: &usize,
-        _form: &usize,
-        _nodes: (&usize, Option<&usize>),
-    ) {
-        // No form owner support.
-    }
-
-    fn remove_from_parent(&mut self, target: &usize) {
-        println!("Remove {} from parent", target);
-    }
-
-    fn reparent_children(&mut self, node: &usize, new_parent: &usize) {
-        println!("Move children from {} to {}", node, new_parent);
-    }
-
-    fn mark_script_already_started(&mut self, node: &usize) {
-        println!("Mark script {} as already started", node);
-    }
-
-    fn set_current_line(&mut self, line_number: u64) {
-        println!("Set current line to {}", line_number);
-    }
-
-    fn pop(&mut self, elem: &usize) {
-        println!("Popped element {}", elem);
-    }
-}
-
-// FIXME: Copy of str::escape_default from std, which is currently unstable
-pub fn escape_default(s: &str) -> String {
-    s.chars().flat_map(|c| c.escape_default()).collect()
-}
-
-fn main() {
-    let sink = Sink {
-        next_id: 1,
-        names: HashMap::new(),
-    };
-    let stdin = io::stdin();
-    parse_document(sink, Default::default())
-        .from_utf8()
-        .read_from(&mut stdin.lock())
-        .unwrap();
-}
diff --git a/fuzz/.gitignore b/fuzz/.gitignore
deleted file mode 100644
index 572e03b..0000000
--- a/fuzz/.gitignore
+++ /dev/null
@@ -1,4 +0,0 @@
-
-target
-corpus
-artifacts
diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml
deleted file mode 100644
index b4dcbe1..0000000
--- a/fuzz/Cargo.toml
+++ /dev/null
@@ -1,27 +0,0 @@
-
-[package]
-name = "html5ever-fuzz"
-version = "0.0.0"
-authors = ["David Korczynski <david@adalogics.com>"]
-publish = false
-edition = "2018"
-
-[package.metadata]
-cargo-fuzz = true
-
-[dependencies]
-libfuzzer-sys = "0.3"
-
-[dependencies.html5ever]
-path = ".."
-
-[dependencies.markup5ever_rcdom]
-path = "../../rcdom/"
-
-# Prevent this from interfering with workspaces
-[workspace]
-members = ["."]
-
-[[bin]]
-name = "fuzz_document_parse"
-path = "fuzz_targets/fuzz_document_parse.rs"
diff --git a/fuzz/fuzz_targets/fuzz_document_parse.rs b/fuzz/fuzz_targets/fuzz_document_parse.rs
deleted file mode 100644
index 17840de..0000000
--- a/fuzz/fuzz_targets/fuzz_document_parse.rs
+++ /dev/null
@@ -1,35 +0,0 @@
-#![no_main]
-use libfuzzer_sys::fuzz_target;
-
-use std::io::BufReader;
-use html5ever::driver::ParseOpts;
-use markup5ever_rcdom::{RcDom, SerializableHandle};
-use html5ever::tendril::TendrilSink;
-use html5ever::tree_builder::TreeBuilderOpts;
-use html5ever::{parse_document, serialize};
-
-// Target inspired by the Rust-Fuzz project
-// https://github.com/rust-fuzz/targets
-fuzz_target!(|data: &[u8]| {
-    let opts = ParseOpts {
-        tree_builder: TreeBuilderOpts {
-            drop_doctype: true,
-            ..Default::default()
-        },
-        ..Default::default()
-    };
-
-    let dom = parse_document(RcDom::default(), opts)
-        .from_utf8()
-        .read_from(&mut BufReader::new(data));
-
-    let dom = if let Ok(dom) = dom {
-        dom
-    } else {
-        return;
-    };
-
-    let mut out = std::io::sink();
-    let document: SerializableHandle = dom.document.into();
-    let _ = serialize(&mut out, &document, Default::default());
-});
diff --git a/src/driver.rs b/src/driver.rs
deleted file mode 100644
index 26db9b8..0000000
--- a/src/driver.rs
+++ /dev/null
@@ -1,137 +0,0 @@
-// Copyright 2014-2017 The html5ever Project Developers. See the
-// COPYRIGHT file at the top-level directory of this distribution.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! High-level interface to the parser.
-
-use crate::buffer_queue::BufferQueue;
-use crate::tokenizer::{Tokenizer, TokenizerOpts, TokenizerResult};
-use crate::tree_builder::{create_element, TreeBuilder, TreeBuilderOpts, TreeSink};
-use crate::{Attribute, QualName};
-
-use std::borrow::Cow;
-
-use crate::tendril;
-use crate::tendril::stream::{TendrilSink, Utf8LossyDecoder};
-use crate::tendril::StrTendril;
-
-/// All-encompassing options struct for the parser.
-#[derive(Clone, Default)]
-pub struct ParseOpts {
-    /// Tokenizer options.
-    pub tokenizer: TokenizerOpts,
-
-    /// Tree builder options.
-    pub tree_builder: TreeBuilderOpts,
-}
-
-/// Parse an HTML document
-///
-/// The returned value implements `tendril::TendrilSink`
-/// so that Unicode input may be provided incrementally,
-/// or all at once with the `one` method.
-///
-/// If your input is bytes, use `Parser::from_utf8`.
-pub fn parse_document<Sink>(sink: Sink, opts: ParseOpts) -> Parser<Sink>
-where
-    Sink: TreeSink,
-{
-    let tb = TreeBuilder::new(sink, opts.tree_builder);
-    let tok = Tokenizer::new(tb, opts.tokenizer);
-    Parser {
-        tokenizer: tok,
-        input_buffer: BufferQueue::new(),
-    }
-}
-
-/// Parse an HTML fragment
-///
-/// The returned value implements `tendril::TendrilSink`
-/// so that Unicode input may be provided incrementally,
-/// or all at once with the `one` method.
-///
-/// If your input is bytes, use `Parser::from_utf8`.
-pub fn parse_fragment<Sink>(
-    mut sink: Sink,
-    opts: ParseOpts,
-    context_name: QualName,
-    context_attrs: Vec<Attribute>,
-) -> Parser<Sink>
-where
-    Sink: TreeSink,
-{
-    let context_elem = create_element(&mut sink, context_name, context_attrs);
-    parse_fragment_for_element(sink, opts, context_elem, None)
-}
-
-/// Like `parse_fragment`, but with an existing context element
-/// and optionally a form element.
-pub fn parse_fragment_for_element<Sink>(
-    sink: Sink,
-    opts: ParseOpts,
-    context_element: Sink::Handle,
-    form_element: Option<Sink::Handle>,
-) -> Parser<Sink>
-where
-    Sink: TreeSink,
-{
-    let tb = TreeBuilder::new_for_fragment(sink, context_element, form_element, opts.tree_builder);
-    let tok_opts = TokenizerOpts {
-        initial_state: Some(tb.tokenizer_state_for_context_elem()),
-        ..opts.tokenizer
-    };
-    let tok = Tokenizer::new(tb, tok_opts);
-    Parser {
-        tokenizer: tok,
-        input_buffer: BufferQueue::new(),
-    }
-}
-
-/// An HTML parser,
-/// ready to receive Unicode input through the `tendril::TendrilSink` trait’s methods.
-pub struct Parser<Sink>
-where
-    Sink: TreeSink,
-{
-    pub tokenizer: Tokenizer<TreeBuilder<Sink::Handle, Sink>>,
-    pub input_buffer: BufferQueue,
-}
-
-impl<Sink: TreeSink> TendrilSink<tendril::fmt::UTF8> for Parser<Sink> {
-    fn process(&mut self, t: StrTendril) {
-        self.input_buffer.push_back(t);
-        // FIXME: Properly support </script> somehow.
-        while let TokenizerResult::Script(_) = self.tokenizer.feed(&mut self.input_buffer) {}
-    }
-
-    // FIXME: Is it too noisy to report every character decoding error?
-    fn error(&mut self, desc: Cow<'static, str>) {
-        self.tokenizer.sink.sink.parse_error(desc)
-    }
-
-    type Output = Sink::Output;
-
-    fn finish(mut self) -> Self::Output {
-        // FIXME: Properly support </script> somehow.
-        while let TokenizerResult::Script(_) = self.tokenizer.feed(&mut self.input_buffer) {}
-        assert!(self.input_buffer.is_empty());
-        self.tokenizer.end();
-        self.tokenizer.sink.sink.finish()
-    }
-}
-
-impl<Sink: TreeSink> Parser<Sink> {
-    /// Wrap this parser into a `TendrilSink` that accepts UTF-8 bytes.
-    ///
-    /// Use this when your input is bytes that are known to be in the UTF-8 encoding.
-    /// Decoding is lossy, like `String::from_utf8_lossy`.
-    #[allow(clippy::wrong_self_convention)]
-    pub fn from_utf8(self) -> Utf8LossyDecoder<Self> {
-        Utf8LossyDecoder::new(self)
-    }
-}
diff --git a/src/lib.rs b/src/lib.rs
index 65fadaa..1817bb1 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,11 +12,8 @@
 #![cfg_attr(test, deny(warnings))]
 #![allow(unused_parens)]
 
-pub use driver::{parse_document, parse_fragment, ParseOpts, Parser};
 pub use markup5ever::*;
 
-pub use serialize::serialize;
-
 #[macro_use]
 mod macros;
 
@@ -24,7 +21,4 @@ mod util {
     pub mod str;
 }
 
-pub mod driver;
-pub mod serialize;
 pub mod tokenizer;
-pub mod tree_builder;
diff --git a/src/serialize/mod.rs b/src/serialize/mod.rs
deleted file mode 100644
index 3a57b47..0000000
--- a/src/serialize/mod.rs
+++ /dev/null
@@ -1,256 +0,0 @@
-// Copyright 2014-2017 The html5ever Project Developers. See the
-// COPYRIGHT file at the top-level directory of this distribution.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-use log::warn;
-pub use markup5ever::serialize::{AttrRef, Serialize, Serializer, TraversalScope};
-use markup5ever::{local_name, namespace_url, ns};
-use std::default::Default;
-use std::io::{self, Write};
-
-use crate::{LocalName, QualName};
-
-pub fn serialize<Wr, T>(writer: Wr, node: &T, opts: SerializeOpts) -> io::Result<()>
-where
-    Wr: Write,
-    T: Serialize,
-{
-    let mut ser = HtmlSerializer::new(writer, opts.clone());
-    node.serialize(&mut ser, opts.traversal_scope)
-}
-
-#[derive(Clone)]
-pub struct SerializeOpts {
-    /// Is scripting enabled?
-    pub scripting_enabled: bool,
-
-    /// Serialize the root node? Default: ChildrenOnly
-    pub traversal_scope: TraversalScope,
-
-    /// If the serializer is asked to serialize an invalid tree, the default
-    /// behavior is to panic in the event that an `end_elem` is created without a
-    /// matching `start_elem`. Setting this to true will prevent those panics by
-    /// creating a default parent on the element stack. No extra start elem will
-    /// actually be written. Default: false
-    pub create_missing_parent: bool,
-}
-
-impl Default for SerializeOpts {
-    fn default() -> SerializeOpts {
-        SerializeOpts {
-            scripting_enabled: true,
-            traversal_scope: TraversalScope::ChildrenOnly(None),
-            create_missing_parent: false,
-        }
-    }
-}
-
-#[derive(Default)]
-struct ElemInfo {
-    html_name: Option<LocalName>,
-    ignore_children: bool
-}
-
-pub struct HtmlSerializer<Wr: Write> {
-    pub writer: Wr,
-    opts: SerializeOpts,
-    stack: Vec<ElemInfo>,
-}
-
-fn tagname(name: &QualName) -> LocalName {
-    match name.ns {
-        ns!(html) | ns!(mathml) | ns!(svg) => (),
-        ref ns => {
-            // FIXME(#122)
-            warn!("node with weird namespace {:?}", ns);
-        },
-    }
-
-    name.local.clone()
-}
-
-impl<Wr: Write> HtmlSerializer<Wr> {
-    pub fn new(writer: Wr, opts: SerializeOpts) -> Self {
-        let html_name = match opts.traversal_scope {
-            TraversalScope::IncludeNode | TraversalScope::ChildrenOnly(None) => None,
-            TraversalScope::ChildrenOnly(Some(ref n)) => Some(tagname(n)),
-        };
-        HtmlSerializer {
-            writer,
-            opts,
-            stack: vec![ElemInfo {
-                html_name,
-                ignore_children: false,
-            }],
-        }
-    }
-
-    fn parent(&mut self) -> &mut ElemInfo {
-        if self.stack.is_empty() {
-            if self.opts.create_missing_parent {
-                warn!("ElemInfo stack empty, creating new parent");
-                self.stack.push(Default::default());
-            } else {
-                panic!("no parent ElemInfo")
-            }
-        }
-        self.stack.last_mut().unwrap()
-    }
-
-    fn write_escaped(&mut self, text: &str, attr_mode: bool) -> io::Result<()> {
-        for c in text.chars() {
-            match c {
-                '&' => self.writer.write_all(b"&amp;"),
-                '\u{00A0}' => self.writer.write_all(b"&nbsp;"),
-                '"' if attr_mode => self.writer.write_all(b"&quot;"),
-                '<' if !attr_mode => self.writer.write_all(b"&lt;"),
-                '>' if !attr_mode => self.writer.write_all(b"&gt;"),
-                c => self.writer.write_fmt(format_args!("{}", c)),
-            }?;
-        }
-        Ok(())
-    }
-}
-
-impl<Wr: Write> Serializer for HtmlSerializer<Wr> {
-    fn start_elem<'a, AttrIter>(&mut self, name: QualName, attrs: AttrIter) -> io::Result<()>
-    where
-        AttrIter: Iterator<Item = AttrRef<'a>>,
-    {
-        let html_name = match name.ns {
-            ns!(html) => Some(name.local.clone()),
-            _ => None,
-        };
-
-        if self.parent().ignore_children {
-            self.stack.push(ElemInfo {
-                html_name,
-                ignore_children: true,
-            });
-            return Ok(());
-        }
-
-        self.writer.write_all(b"<")?;
-        self.writer.write_all(tagname(&name).as_bytes())?;
-        for (name, value) in attrs {
-            self.writer.write_all(b" ")?;
-
-            match name.ns {
-                ns!() => (),
-                ns!(xml) => self.writer.write_all(b"xml:")?,
-                ns!(xmlns) => {
-                    if name.local != local_name!("xmlns") {
-                        self.writer.write_all(b"xmlns:")?;
-                    }
-                },
-                ns!(xlink) => self.writer.write_all(b"xlink:")?,
-                ref ns => {
-                    // FIXME(#122)
-                    warn!("attr with weird namespace {:?}", ns);
-                    self.writer.write_all(b"unknown_namespace:")?;
-                },
-            }
-
-            self.writer.write_all(name.local.as_bytes())?;
-            self.writer.write_all(b"=\"")?;
-            self.write_escaped(value, true)?;
-            self.writer.write_all(b"\"")?;
-        }
-        self.writer.write_all(b">")?;
-
-        let ignore_children = name.ns == ns!(html) &&
-            match name.local {
-                local_name!("area") |
-                local_name!("base") |
-                local_name!("basefont") |
-                local_name!("bgsound") |
-                local_name!("br") |
-                local_name!("col") |
-                local_name!("embed") |
-                local_name!("frame") |
-                local_name!("hr") |
-                local_name!("img") |
-                local_name!("input") |
-                local_name!("keygen") |
-                local_name!("link") |
-                local_name!("meta") |
-                local_name!("param") |
-                local_name!("source") |
-                local_name!("track") |
-                local_name!("wbr") => true,
-                _ => false,
-            };
-
-        self.stack.push(ElemInfo {
-            html_name,
-            ignore_children,
-        });
-
-        Ok(())
-    }
-
-    fn end_elem(&mut self, name: QualName) -> io::Result<()> {
-        let info = match self.stack.pop() {
-            Some(info) => info,
-            None if self.opts.create_missing_parent => {
-                warn!("missing ElemInfo, creating default.");
-                Default::default()
-            },
-            _ => panic!("no ElemInfo"),
-        };
-        if info.ignore_children {
-            return Ok(());
-        }
-
-        self.writer.write_all(b"</")?;
-        self.writer.write_all(tagname(&name).as_bytes())?;
-        self.writer.write_all(b">")
-    }
-
-    fn write_text(&mut self, text: &str) -> io::Result<()> {
-        let escape = match self.parent().html_name {
-            Some(local_name!("style")) |
-            Some(local_name!("script")) |
-            Some(local_name!("xmp")) |
-            Some(local_name!("iframe")) |
-            Some(local_name!("noembed")) |
-            Some(local_name!("noframes")) |
-            Some(local_name!("plaintext")) => false,
-
-            Some(local_name!("noscript")) => !self.opts.scripting_enabled,
-
-            _ => true,
-        };
-
-        if escape {
-            self.write_escaped(text, false)
-        } else {
-            self.writer.write_all(text.as_bytes())
-        }
-    }
-
-    fn write_comment(&mut self, text: &str) -> io::Result<()> {
-        self.writer.write_all(b"<!--")?;
-        self.writer.write_all(text.as_bytes())?;
-        self.writer.write_all(b"-->")
-    }
-
-    fn write_doctype(&mut self, name: &str) -> io::Result<()> {
-        self.writer.write_all(b"<!DOCTYPE ")?;
-        self.writer.write_all(name.as_bytes())?;
-        self.writer.write_all(b">")
-    }
-
-    fn write_processing_instruction(&mut self, target: &str, data: &str) -> io::Result<()> {
-        self.writer.write_all(b"<?")?;
-        self.writer.write_all(target.as_bytes())?;
-        self.writer.write_all(b" ")?;
-        self.writer.write_all(data.as_bytes())?;
-        self.writer.write_all(b">")
-    }
-}
diff --git a/src/tree_builder/data.rs b/src/tree_builder/data.rs
deleted file mode 100644
index 9d51a71..0000000
--- a/src/tree_builder/data.rs
+++ /dev/null
@@ -1,171 +0,0 @@
-// Copyright 2014-2017 The html5ever Project Developers. See the
-// COPYRIGHT file at the top-level directory of this distribution.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-use crate::interface::{LimitedQuirks, NoQuirks, Quirks, QuirksMode};
-use crate::tendril::StrTendril;
-use crate::tokenizer::Doctype;
-
-// These should all be lowercase, for ASCII-case-insensitive matching.
-static QUIRKY_PUBLIC_PREFIXES: &'static [&'static str] = &[
-    "-//advasoft ltd//dtd html 3.0 aswedit + extensions//",
-    "-//as//dtd html 3.0 aswedit + extensions//",
-    "-//ietf//dtd html 2.0 level 1//",
-    "-//ietf//dtd html 2.0 level 2//",
-    "-//ietf//dtd html 2.0 strict level 1//",
-    "-//ietf//dtd html 2.0 strict level 2//",
-    "-//ietf//dtd html 2.0 strict//",
-    "-//ietf//dtd html 2.0//",
-    "-//ietf//dtd html 2.1e//",
-    "-//ietf//dtd html 3.0//",
-    "-//ietf//dtd html 3.2 final//",
-    "-//ietf//dtd html 3.2//",
-    "-//ietf//dtd html 3//",
-    "-//ietf//dtd html level 0//",
-    "-//ietf//dtd html level 1//",
-    "-//ietf//dtd html level 2//",
-    "-//ietf//dtd html level 3//",
-    "-//ietf//dtd html strict level 0//",
-    "-//ietf//dtd html strict level 1//",
-    "-//ietf//dtd html strict level 2//",
-    "-//ietf//dtd html strict level 3//",
-    "-//ietf//dtd html strict//",
-    "-//ietf//dtd html//",
-    "-//metrius//dtd metrius presentational//",
-    "-//microsoft//dtd internet explorer 2.0 html strict//",
-    "-//microsoft//dtd internet explorer 2.0 html//",
-    "-//microsoft//dtd internet explorer 2.0 tables//",
-    "-//microsoft//dtd internet explorer 3.0 html strict//",
-    "-//microsoft//dtd internet explorer 3.0 html//",
-    "-//microsoft//dtd internet explorer 3.0 tables//",
-    "-//netscape comm. corp.//dtd html//",
-    "-//netscape comm. corp.//dtd strict html//",
-    "-//o'reilly and associates//dtd html 2.0//",
-    "-//o'reilly and associates//dtd html extended 1.0//",
-    "-//o'reilly and associates//dtd html extended relaxed 1.0//",
-    "-//softquad software//dtd hotmetal pro 6.0::19990601::extensions to html 4.0//",
-    "-//softquad//dtd hotmetal pro 4.0::19971010::extensions to html 4.0//",
-    "-//spyglass//dtd html 2.0 extended//",
-    "-//sq//dtd html 2.0 hotmetal + extensions//",
-    "-//sun microsystems corp.//dtd hotjava html//",
-    "-//sun microsystems corp.//dtd hotjava strict html//",
-    "-//w3c//dtd html 3 1995-03-24//",
-    "-//w3c//dtd html 3.2 draft//",
-    "-//w3c//dtd html 3.2 final//",
-    "-//w3c//dtd html 3.2//",
-    "-//w3c//dtd html 3.2s draft//",
-    "-//w3c//dtd html 4.0 frameset//",
-    "-//w3c//dtd html 4.0 transitional//",
-    "-//w3c//dtd html experimental 19960712//",
-    "-//w3c//dtd html experimental 970421//",
-    "-//w3c//dtd w3 html//",
-    "-//w3o//dtd w3 html 3.0//",
-    "-//webtechs//dtd mozilla html 2.0//",
-    "-//webtechs//dtd mozilla html//",
-];
-
-static QUIRKY_PUBLIC_MATCHES: &'static [&'static str] = &[
-    "-//w3o//dtd w3 html strict 3.0//en//",
-    "-/w3c/dtd html 4.0 transitional/en",
-    "html",
-];
-
-static QUIRKY_SYSTEM_MATCHES: &'static [&'static str] =
-    &["http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd"];
-
-static LIMITED_QUIRKY_PUBLIC_PREFIXES: &'static [&'static str] = &[
-    "-//w3c//dtd xhtml 1.0 frameset//",
-    "-//w3c//dtd xhtml 1.0 transitional//",
-];
-
-static HTML4_PUBLIC_PREFIXES: &'static [&'static str] = &[
-    "-//w3c//dtd html 4.01 frameset//",
-    "-//w3c//dtd html 4.01 transitional//",
-];
-
-pub fn doctype_error_and_quirks(doctype: &Doctype, iframe_srcdoc: bool) -> (bool, QuirksMode) {
-    fn opt_string_as_slice<'t>(x: &'t Option<String>) -> Option<&'t str> {
-        x.as_ref().map(|y| &y[..])
-    }
-
-    fn opt_tendril_as_slice<'t>(x: &'t Option<StrTendril>) -> Option<&'t str> {
-        match *x {
-            Some(ref t) => Some(t),
-            None => None,
-        }
-    }
-
-    fn opt_to_ascii_lower(x: Option<&str>) -> Option<String> {
-        x.map(|y| y.to_ascii_lowercase())
-    }
-
-    let name = opt_tendril_as_slice(&doctype.name);
-    let public = opt_tendril_as_slice(&doctype.public_id);
-    let system = opt_tendril_as_slice(&doctype.system_id);
-
-    let err = match (name, public, system) {
-        (Some("html"), None, None) |
-        (Some("html"), None, Some("about:legacy-compat")) |
-        (Some("html"), Some("-//W3C//DTD HTML 4.0//EN"), None) |
-        (
-            Some("html"),
-            Some("-//W3C//DTD HTML 4.0//EN"),
-            Some("http://www.w3.org/TR/REC-html40/strict.dtd"),
-        ) |
-        (Some("html"), Some("-//W3C//DTD HTML 4.01//EN"), None) |
-        (
-            Some("html"),
-            Some("-//W3C//DTD HTML 4.01//EN"),
-            Some("http://www.w3.org/TR/html4/strict.dtd"),
-        ) |
-        (
-            Some("html"),
-            Some("-//W3C//DTD XHTML 1.0 Strict//EN"),
-            Some("http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"),
-        ) |
-        (
-            Some("html"),
-            Some("-//W3C//DTD XHTML 1.1//EN"),
-            Some("http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"),
-        ) => false,
-
-        _ => true,
-    };
-
-    // FIXME: We could do something asymptotically faster here.
-    // But there aren't many strings, and this happens at most once per parse.
-    fn contains_pfx(haystack: &[&str], needle: &str) -> bool {
-        haystack.iter().any(|&x| needle.starts_with(x))
-    }
-
-    // Quirks-mode matches are case-insensitive.
-    let public = opt_to_ascii_lower(public);
-    let system = opt_to_ascii_lower(system);
-
-    let quirk = match (opt_string_as_slice(&public), opt_string_as_slice(&system)) {
-        _ if doctype.force_quirks => Quirks,
-        _ if name != Some("html") => Quirks,
-
-        _ if iframe_srcdoc => NoQuirks,
-
-        (Some(ref p), _) if QUIRKY_PUBLIC_MATCHES.contains(p) => Quirks,
-        (_, Some(ref s)) if QUIRKY_SYSTEM_MATCHES.contains(s) => Quirks,
-
-        (Some(p), _) if contains_pfx(QUIRKY_PUBLIC_PREFIXES, p) => Quirks,
-        (Some(p), _) if contains_pfx(LIMITED_QUIRKY_PUBLIC_PREFIXES, p) => LimitedQuirks,
-
-        (Some(p), s) if contains_pfx(HTML4_PUBLIC_PREFIXES, p) => match s {
-            None => Quirks,
-            Some(_) => LimitedQuirks,
-        },
-
-        _ => NoQuirks,
-    };
-
-    (err, quirk)
-}
diff --git a/src/tree_builder/mod.rs b/src/tree_builder/mod.rs
deleted file mode 100644
index a6fa8bf..0000000
--- a/src/tree_builder/mod.rs
+++ /dev/null
@@ -1,1681 +0,0 @@
-// Copyright 2014-2017 The html5ever Project Developers. See the
-// COPYRIGHT file at the top-level directory of this distribution.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-#![allow(warnings)]
-
-//! The HTML5 tree builder.
-
-pub use crate::interface::{create_element, ElementFlags, NextParserState, Tracer, TreeSink};
-pub use crate::interface::{AppendNode, AppendText, Attribute, NodeOrText};
-pub use crate::interface::{LimitedQuirks, NoQuirks, Quirks, QuirksMode};
-
-use self::types::*;
-
-use crate::tendril::StrTendril;
-use crate::{ExpandedName, LocalName, Namespace, QualName};
-
-use crate::tokenizer;
-use crate::tokenizer::states as tok_state;
-use crate::tokenizer::{Doctype, EndTag, StartTag, Tag, TokenSink, TokenSinkResult};
-
-use crate::util::str::is_ascii_whitespace;
-
-use std::borrow::Cow::Borrowed;
-use std::collections::VecDeque;
-use std::default::Default;
-use std::iter::{Enumerate, Rev};
-use std::mem::replace;
-use std::{fmt, slice};
-
-use crate::tokenizer::states::{RawData, RawKind};
-use crate::tree_builder::tag_sets::*;
-use crate::tree_builder::types::*;
-use crate::util::str::to_escaped_string;
-use log::{debug, log_enabled, warn, Level};
-use mac::{_tt_as_expr_hack, format_if, matches};
-
-pub use self::PushFlag::*;
-
-#[macro_use]
-mod tag_sets;
-
-mod data;
-mod types;
-
-include!(concat!(env!("OUT_DIR"), "/rules.rs"));
-
-/// Tree builder options, with an impl for Default.
-#[derive(Copy, Clone)]
-pub struct TreeBuilderOpts {
-    /// Report all parse errors described in the spec, at some
-    /// performance penalty?  Default: false
-    pub exact_errors: bool,
-
-    /// Is scripting enabled?
-    pub scripting_enabled: bool,
-
-    /// Is this an `iframe srcdoc` document?
-    pub iframe_srcdoc: bool,
-
-    /// Should we drop the DOCTYPE (if any) from the tree?
-    pub drop_doctype: bool,
-
-    /// Obsolete, ignored.
-    pub ignore_missing_rules: bool,
-
-    /// Initial TreeBuilder quirks mode. Default: NoQuirks
-    pub quirks_mode: QuirksMode,
-}
-
-impl Default for TreeBuilderOpts {
-    fn default() -> TreeBuilderOpts {
-        TreeBuilderOpts {
-            exact_errors: false,
-            scripting_enabled: true,
-            iframe_srcdoc: false,
-            drop_doctype: false,
-            ignore_missing_rules: false,
-            quirks_mode: NoQuirks,
-        }
-    }
-}
-
-/// The HTML tree builder.
-pub struct TreeBuilder<Handle, Sink> {
-    /// Options controlling the behavior of the tree builder.
-    opts: TreeBuilderOpts,
-
-    /// Consumer of tree modifications.
-    pub sink: Sink,
-
-    /// Insertion mode.
-    mode: InsertionMode,
-
-    /// Original insertion mode, used by Text and InTableText modes.
-    orig_mode: Option<InsertionMode>,
-
-    /// Stack of template insertion modes.
-    template_modes: Vec<InsertionMode>,
-
-    /// Pending table character tokens.
-    pending_table_text: Vec<(SplitStatus, StrTendril)>,
-
-    /// Quirks mode as set by the parser.
-    /// FIXME: can scripts etc. change this?
-    quirks_mode: QuirksMode,
-
-    /// The document node, which is created by the sink.
-    doc_handle: Handle,
-
-    /// Stack of open elements, most recently added at end.
-    open_elems: Vec<Handle>,
-
-    /// List of active formatting elements.
-    active_formatting: Vec<FormatEntry<Handle>>,
-
-    //§ the-element-pointers
-    /// Head element pointer.
-    head_elem: Option<Handle>,
-
-    /// Form element pointer.
-    form_elem: Option<Handle>,
-    //§ END
-    /// Frameset-ok flag.
-    frameset_ok: bool,
-
-    /// Ignore a following U+000A LINE FEED?
-    ignore_lf: bool,
-
-    /// Is foster parenting enabled?
-    foster_parenting: bool,
-
-    /// The context element for the fragment parsing algorithm.
-    context_elem: Option<Handle>,
-
-    /// Track current line
-    current_line: u64,
-    // WARNING: If you add new fields that contain Handles, you
-    // must add them to trace_handles() below to preserve memory
-    // safety!
-    //
-    // FIXME: Auto-generate the trace hooks like Servo does.
-}
-
-impl<Handle, Sink> TreeBuilder<Handle, Sink>
-where
-    Handle: Clone,
-    Sink: TreeSink<Handle = Handle>,
-{
-    /// Create a new tree builder which sends tree modifications to a particular `TreeSink`.
-    ///
-    /// The tree builder is also a `TokenSink`.
-    pub fn new(mut sink: Sink, opts: TreeBuilderOpts) -> TreeBuilder<Handle, Sink> {
-        let doc_handle = sink.get_document();
-        TreeBuilder {
-            opts: opts,
-            sink: sink,
-            mode: Initial,
-            orig_mode: None,
-            template_modes: vec![],
-            pending_table_text: vec![],
-            quirks_mode: opts.quirks_mode,
-            doc_handle: doc_handle,
-            open_elems: vec![],
-            active_formatting: vec![],
-            head_elem: None,
-            form_elem: None,
-            frameset_ok: true,
-            ignore_lf: false,
-            foster_parenting: false,
-            context_elem: None,
-            current_line: 1,
-        }
-    }
-
-    /// Create a new tree builder which sends tree modifications to a particular `TreeSink`.
-    /// This is for parsing fragments.
-    ///
-    /// The tree builder is also a `TokenSink`.
-    pub fn new_for_fragment(
-        mut sink: Sink,
-        context_elem: Handle,
-        form_elem: Option<Handle>,
-        opts: TreeBuilderOpts,
-    ) -> TreeBuilder<Handle, Sink> {
-        let doc_handle = sink.get_document();
-        let context_is_template = sink.elem_name(&context_elem) == expanded_name!(html "template");
-        let mut tb = TreeBuilder {
-            opts: opts,
-            sink: sink,
-            mode: Initial,
-            orig_mode: None,
-            template_modes: if context_is_template {
-                vec![InTemplate]
-            } else {
-                vec![]
-            },
-            pending_table_text: vec![],
-            quirks_mode: opts.quirks_mode,
-            doc_handle: doc_handle,
-            open_elems: vec![],
-            active_formatting: vec![],
-            head_elem: None,
-            form_elem: form_elem,
-            frameset_ok: true,
-            ignore_lf: false,
-            foster_parenting: false,
-            context_elem: Some(context_elem),
-            current_line: 1,
-        };
-
-        // https://html.spec.whatwg.org/multipage/#parsing-html-fragments
-        // 5. Let root be a new html element with no attributes.
-        // 6. Append the element root to the Document node created above.
-        // 7. Set up the parser's stack of open elements so that it contains just the single element root.
-        tb.create_root(vec![]);
-        // 10. Reset the parser's insertion mode appropriately.
-        tb.mode = tb.reset_insertion_mode();
-
-        tb
-    }
-
-    // https://html.spec.whatwg.org/multipage/#concept-frag-parse-context
-    // Step 4. Set the state of the HTML parser's tokenization stage as follows:
-    pub fn tokenizer_state_for_context_elem(&self) -> tok_state::State {
-        let elem = self.context_elem.as_ref().expect("no context element");
-        let name = match self.sink.elem_name(elem) {
-            ExpandedName {
-                ns: &ns!(html),
-                local,
-            } => local,
-            _ => return tok_state::Data,
-        };
-        match *name {
-            local_name!("title") | local_name!("textarea") => tok_state::RawData(tok_state::Rcdata),
-
-            local_name!("style") |
-            local_name!("xmp") |
-            local_name!("iframe") |
-            local_name!("noembed") |
-            local_name!("noframes") => tok_state::RawData(tok_state::Rawtext),
-
-            local_name!("script") => tok_state::RawData(tok_state::ScriptData),
-
-            local_name!("noscript") => {
-                if self.opts.scripting_enabled {
-                    tok_state::RawData(tok_state::Rawtext)
-                } else {
-                    tok_state::Data
-                }
-            },
-
-            local_name!("plaintext") => tok_state::Plaintext,
-
-            _ => tok_state::Data,
-        }
-    }
-
-    /// Call the `Tracer`'s `trace_handle` method on every `Handle` in the tree builder's
-    /// internal state.  This is intended to support garbage-collected DOMs.
-    pub fn trace_handles(&self, tracer: &Tracer<Handle = Handle>) {
-        tracer.trace_handle(&self.doc_handle);
-        for e in &self.open_elems {
-            tracer.trace_handle(e);
-        }
-        for e in &self.active_formatting {
-            match e {
-                &Element(ref h, _) => tracer.trace_handle(h),
-                _ => (),
-            }
-        }
-        self.head_elem.as_ref().map(|h| tracer.trace_handle(h));
-        self.form_elem.as_ref().map(|h| tracer.trace_handle(h));
-        self.context_elem.as_ref().map(|h| tracer.trace_handle(h));
-    }
-
-    #[allow(dead_code)]
-    fn dump_state(&self, label: String) {
-        println!("dump_state on {}", label);
-        print!("    open_elems:");
-        for node in self.open_elems.iter() {
-            let name = self.sink.elem_name(node);
-            match *name.ns {
-                ns!(html) => print!(" {}", name.local),
-                _ => panic!(),
-            }
-        }
-        println!("");
-        print!("    active_formatting:");
-        for entry in self.active_formatting.iter() {
-            match entry {
-                &Marker => print!(" Marker"),
-                &Element(ref h, _) => {
-                    let name = self.sink.elem_name(h);
-                    match *name.ns {
-                        ns!(html) => print!(" {}", name.local),
-                        _ => panic!(),
-                    }
-                },
-            }
-        }
-        println!("");
-    }
-
-    fn debug_step(&self, mode: InsertionMode, token: &Token) {
-        if log_enabled!(Level::Debug) {
-            debug!(
-                "processing {} in insertion mode {:?}",
-                to_escaped_string(token),
-                mode
-            );
-        }
-    }
-
-    fn process_to_completion(&mut self, mut token: Token) -> TokenSinkResult<Handle> {
-        // Queue of additional tokens yet to be processed.
-        // This stays empty in the common case where we don't split whitespace.
-        let mut more_tokens = VecDeque::new();
-
-        loop {
-            let should_have_acknowledged_self_closing_flag = matches!(
-                token,
-                TagToken(Tag {
-                    self_closing: true,
-                    kind: StartTag,
-                    ..
-                })
-            );
-            let result = if self.is_foreign(&token) {
-                self.step_foreign(token)
-            } else {
-                let mode = self.mode;
-                self.step(mode, token)
-            };
-            match result {
-                Done => {
-                    if should_have_acknowledged_self_closing_flag {
-                        self.sink
-                            .parse_error(Borrowed("Unacknowledged self-closing tag"));
-                    }
-                    token = unwrap_or_return!(
-                        more_tokens.pop_front(),
-                        tokenizer::TokenSinkResult::Continue
-                    );
-                },
-                DoneAckSelfClosing => {
-                    token = unwrap_or_return!(
-                        more_tokens.pop_front(),
-                        tokenizer::TokenSinkResult::Continue
-                    );
-                },
-                Reprocess(m, t) => {
-                    self.mode = m;
-                    token = t;
-                },
-                ReprocessForeign(t) => {
-                    token = t;
-                },
-                SplitWhitespace(mut buf) => {
-                    let p = buf.pop_front_char_run(is_ascii_whitespace);
-                    let (first, is_ws) = unwrap_or_return!(p, tokenizer::TokenSinkResult::Continue);
-                    let status = if is_ws { Whitespace } else { NotWhitespace };
-                    token = CharacterTokens(status, first);
-
-                    if buf.len32() > 0 {
-                        more_tokens.push_back(CharacterTokens(NotSplit, buf));
-                    }
-                },
-                Script(node) => {
-                    assert!(more_tokens.is_empty());
-                    return tokenizer::TokenSinkResult::Script(node);
-                },
-                ToPlaintext => {
-                    assert!(more_tokens.is_empty());
-                    return tokenizer::TokenSinkResult::Plaintext;
-                },
-                ToRawData(k) => {
-                    assert!(more_tokens.is_empty());
-                    return tokenizer::TokenSinkResult::RawData(k);
-                },
-            }
-        }
-    }
-
-    /// Are we parsing a HTML fragment?
-    pub fn is_fragment(&self) -> bool {
-        self.context_elem.is_some()
-    }
-
-    /// https://html.spec.whatwg.org/multipage/#appropriate-place-for-inserting-a-node
-    fn appropriate_place_for_insertion(
-        &mut self,
-        override_target: Option<Handle>,
-    ) -> InsertionPoint<Handle> {
-        use self::tag_sets::*;
-
-        declare_tag_set!(foster_target = "table" "tbody" "tfoot" "thead" "tr");
-        let target = override_target.unwrap_or_else(|| self.current_node().clone());
-        if !(self.foster_parenting && self.elem_in(&target, foster_target)) {
-            if self.html_elem_named(&target, local_name!("template")) {
-                // No foster parenting (inside template).
-                let contents = self.sink.get_template_contents(&target);
-                return LastChild(contents);
-            } else {
-                // No foster parenting (the common case).
-                return LastChild(target);
-            }
-        }
-
-        // Foster parenting
-        let mut iter = self.open_elems.iter().rev().peekable();
-        while let Some(elem) = iter.next() {
-            if self.html_elem_named(&elem, local_name!("template")) {
-                let contents = self.sink.get_template_contents(&elem);
-                return LastChild(contents);
-            } else if self.html_elem_named(&elem, local_name!("table")) {
-                return TableFosterParenting {
-                    element: elem.clone(),
-                    prev_element: (*iter.peek().unwrap()).clone(),
-                };
-            }
-        }
-        let html_elem = self.html_elem();
-        LastChild(html_elem.clone())
-    }
-
-    fn insert_at(&mut self, insertion_point: InsertionPoint<Handle>, child: NodeOrText<Handle>) {
-        match insertion_point {
-            LastChild(parent) => self.sink.append(&parent, child),
-            BeforeSibling(sibling) => self.sink.append_before_sibling(&sibling, child),
-            TableFosterParenting {
-                element,
-                prev_element,
-            } => self
-                .sink
-                .append_based_on_parent_node(&element, &prev_element, child),
-        }
-    }
-}
-
-impl<Handle, Sink> TokenSink for TreeBuilder<Handle, Sink>
-where
-    Handle: Clone,
-    Sink: TreeSink<Handle = Handle>,
-{
-    type Handle = Handle;
-
-    fn process_token(
-        &mut self,
-        token: tokenizer::Token,
-        line_number: u64,
-    ) -> TokenSinkResult<Handle> {
-        if line_number != self.current_line {
-            self.sink.set_current_line(line_number);
-        }
-        let ignore_lf = replace(&mut self.ignore_lf, false);
-
-        // Handle `ParseError` and `DoctypeToken`; convert everything else to the local `Token` type.
-        let token = match token {
-            tokenizer::ParseError(e) => {
-                self.sink.parse_error(e);
-                return tokenizer::TokenSinkResult::Continue;
-            },
-
-            tokenizer::DoctypeToken(dt) => {
-                if self.mode == Initial {
-                    let (err, quirk) = data::doctype_error_and_quirks(&dt, self.opts.iframe_srcdoc);
-                    if err {
-                        self.sink.parse_error(format_if!(
-                            self.opts.exact_errors,
-                            "Bad DOCTYPE",
-                            "Bad DOCTYPE: {:?}",
-                            dt
-                        ));
-                    }
-                    let Doctype {
-                        name,
-                        public_id,
-                        system_id,
-                        force_quirks: _,
-                    } = dt;
-                    if !self.opts.drop_doctype {
-                        self.sink.append_doctype_to_document(
-                            name.unwrap_or(StrTendril::new()),
-                            public_id.unwrap_or(StrTendril::new()),
-                            system_id.unwrap_or(StrTendril::new()),
-                        );
-                    }
-                    self.set_quirks_mode(quirk);
-
-                    self.mode = BeforeHtml;
-                    return tokenizer::TokenSinkResult::Continue;
-                } else {
-                    self.sink.parse_error(format_if!(
-                        self.opts.exact_errors,
-                        "DOCTYPE in body",
-                        "DOCTYPE in insertion mode {:?}",
-                        self.mode
-                    ));
-                    return tokenizer::TokenSinkResult::Continue;
-                }
-            },
-
-            tokenizer::TagToken(x) => TagToken(x),
-            tokenizer::CommentToken(x) => CommentToken(x),
-            tokenizer::NullCharacterToken => NullCharacterToken,
-            tokenizer::EOFToken => EOFToken,
-
-            tokenizer::CharacterTokens(mut x) => {
-                if ignore_lf && x.starts_with("\n") {
-                    x.pop_front(1);
-                }
-                if x.is_empty() {
-                    return tokenizer::TokenSinkResult::Continue;
-                }
-                CharacterTokens(NotSplit, x)
-            },
-        };
-
-        self.process_to_completion(token)
-    }
-
-    fn end(&mut self) {
-        for elem in self.open_elems.drain(..).rev() {
-            self.sink.pop(&elem);
-        }
-    }
-
-    fn adjusted_current_node_present_but_not_in_html_namespace(&self) -> bool {
-        !self.open_elems.is_empty() &&
-            self.sink.elem_name(self.adjusted_current_node()).ns != &ns!(html)
-    }
-}
-
-pub fn html_elem<Handle>(open_elems: &[Handle]) -> &Handle {
-    &open_elems[0]
-}
-
-pub struct ActiveFormattingIter<'a, Handle: 'a> {
-    iter: Rev<Enumerate<slice::Iter<'a, FormatEntry<Handle>>>>,
-}
-
-impl<'a, Handle> Iterator for ActiveFormattingIter<'a, Handle> {
-    type Item = (usize, &'a Handle, &'a Tag);
-    fn next(&mut self) -> Option<(usize, &'a Handle, &'a Tag)> {
-        match self.iter.next() {
-            None | Some((_, &Marker)) => None,
-            Some((i, &Element(ref h, ref t))) => Some((i, h, t)),
-        }
-    }
-}
-
-pub enum PushFlag {
-    Push,
-    NoPush,
-}
-
-enum Bookmark<Handle> {
-    Replace(Handle),
-    InsertAfter(Handle),
-}
-
-macro_rules! qualname {
-    ("", $local:tt) => {
-        QualName {
-            prefix: None,
-            ns: ns!(),
-            local: local_name!($local),
-        }
-    };
-    ($prefix: tt $ns:tt $local:tt) => {
-        QualName {
-            prefix: Some(namespace_prefix!($prefix)),
-            ns: ns!($ns),
-            local: local_name!($local),
-        }
-    };
-}
-
-#[doc(hidden)]
-impl<Handle, Sink> TreeBuilder<Handle, Sink>
-where
-    Handle: Clone,
-    Sink: TreeSink<Handle = Handle>,
-{
-    fn unexpected<T: fmt::Debug>(&mut self, _thing: &T) -> ProcessResult<Handle> {
-        self.sink.parse_error(format_if!(
-            self.opts.exact_errors,
-            "Unexpected token",
-            "Unexpected token {} in insertion mode {:?}",
-            to_escaped_string(_thing),
-            self.mode
-        ));
-        Done
-    }
-
-    fn assert_named(&mut self, node: &Handle, name: LocalName) {
-        assert!(self.html_elem_named(&node, name));
-    }
-
-    /// Iterate over the active formatting elements (with index in the list) from the end
-    /// to the last marker, or the beginning if there are no markers.
-    fn active_formatting_end_to_marker<'a>(&'a self) -> ActiveFormattingIter<'a, Handle> {
-        ActiveFormattingIter {
-            iter: self.active_formatting.iter().enumerate().rev(),
-        }
-    }
-
-    fn position_in_active_formatting(&self, element: &Handle) -> Option<usize> {
-        self.active_formatting.iter().position(|n| match n {
-            &Marker => false,
-            &Element(ref handle, _) => self.sink.same_node(handle, element),
-        })
-    }
-
-    fn set_quirks_mode(&mut self, mode: QuirksMode) {
-        self.quirks_mode = mode;
-        self.sink.set_quirks_mode(mode);
-    }
-
-    fn stop_parsing(&mut self) -> ProcessResult<Handle> {
-        Done
-    }
-
-    //§ parsing-elements-that-contain-only-text
-    // Switch to `Text` insertion mode, save the old mode, and
-    // switch the tokenizer to a raw-data state.
-    // The latter only takes effect after the current / next
-    // `process_token` of a start tag returns!
-    fn to_raw_text_mode(&mut self, k: RawKind) -> ProcessResult<Handle> {
-        self.orig_mode = Some(self.mode);
-        self.mode = Text;
-        ToRawData(k)
-    }
-
-    // The generic raw text / RCDATA parsing algorithm.
-    fn parse_raw_data(&mut self, tag: Tag, k: RawKind) -> ProcessResult<Handle> {
-        self.insert_element_for(tag);
-        self.to_raw_text_mode(k)
-    }
-    //§ END
-
-    fn current_node(&self) -> &Handle {
-        self.open_elems.last().expect("no current element")
-    }
-
-    fn adjusted_current_node(&self) -> &Handle {
-        if self.open_elems.len() == 1 {
-            if let Some(ctx) = self.context_elem.as_ref() {
-                return ctx;
-            }
-        }
-        self.current_node()
-    }
-
-    fn current_node_in<TagSet>(&self, set: TagSet) -> bool
-    where
-        TagSet: Fn(ExpandedName) -> bool,
-    {
-        set(self.sink.elem_name(self.current_node()))
-    }
-
-    // Insert at the "appropriate place for inserting a node".
-    fn insert_appropriately(&mut self, child: NodeOrText<Handle>, override_target: Option<Handle>) {
-        let insertion_point = self.appropriate_place_for_insertion(override_target);
-        self.insert_at(insertion_point, child);
-    }
-
-    fn adoption_agency(&mut self, subject: LocalName) {
-        // 1.
-        if self.current_node_named(subject.clone()) {
-            if self
-                .position_in_active_formatting(self.current_node())
-                .is_none()
-            {
-                self.pop();
-                return;
-            }
-        }
-
-        // 2. 3. 4.
-        for _ in 0..8 {
-            // 5.
-            let (fmt_elem_index, fmt_elem, fmt_elem_tag) = unwrap_or_return!(
-                // We clone the Handle and Tag so they don't cause an immutable borrow of self.
-                self.active_formatting_end_to_marker()
-                    .filter(|&(_, _, tag)| tag.name == subject)
-                    .next()
-                    .map(|(i, h, t)| (i, h.clone(), t.clone())),
-                {
-                    self.process_end_tag_in_body(Tag {
-                        kind: EndTag,
-                        name: subject,
-                        self_closing: false,
-                        attrs: vec![],
-                    });
-                }
-            );
-
-            let fmt_elem_stack_index = unwrap_or_return!(
-                self.open_elems
-                    .iter()
-                    .rposition(|n| self.sink.same_node(n, &fmt_elem)),
-                {
-                    self.sink
-                        .parse_error(Borrowed("Formatting element not open"));
-                    self.active_formatting.remove(fmt_elem_index);
-                }
-            );
-
-            // 7.
-            if !self.in_scope(default_scope, |n| self.sink.same_node(&n, &fmt_elem)) {
-                self.sink
-                    .parse_error(Borrowed("Formatting element not in scope"));
-                return;
-            }
-
-            // 8.
-            if !self.sink.same_node(self.current_node(), &fmt_elem) {
-                self.sink
-                    .parse_error(Borrowed("Formatting element not current node"));
-            }
-
-            // 9.
-            let (furthest_block_index, furthest_block) = unwrap_or_return!(
-                self.open_elems
-                    .iter()
-                    .enumerate()
-                    .skip(fmt_elem_stack_index)
-                    .filter(|&(_, open_element)| self.elem_in(open_element, special_tag))
-                    .next()
-                    .map(|(i, h)| (i, h.clone())),
-                // 10.
-                {
-                    self.open_elems.truncate(fmt_elem_stack_index);
-                    self.active_formatting.remove(fmt_elem_index);
-                }
-            );
-
-            // 11.
-            let common_ancestor = self.open_elems[fmt_elem_stack_index - 1].clone();
-
-            // 12.
-            let mut bookmark = Bookmark::Replace(fmt_elem.clone());
-
-            // 13.
-            let mut node;
-            let mut node_index = furthest_block_index;
-            let mut last_node = furthest_block.clone();
-
-            // 13.1.
-            let mut inner_counter = 0;
-            loop {
-                // 13.2.
-                inner_counter += 1;
-
-                // 13.3.
-                node_index -= 1;
-                node = self.open_elems[node_index].clone();
-
-                // 13.4.
-                if self.sink.same_node(&node, &fmt_elem) {
-                    break;
-                }
-
-                // 13.5.
-                if inner_counter > 3 {
-                    self.position_in_active_formatting(&node)
-                        .map(|position| self.active_formatting.remove(position));
-                    self.open_elems.remove(node_index);
-                    continue;
-                }
-
-                let node_formatting_index = unwrap_or_else!(
-                    self.position_in_active_formatting(&node),
-                    // 13.6.
-                    {
-                        self.open_elems.remove(node_index);
-                        continue;
-                    }
-                );
-
-                // 13.7.
-                let tag = match self.active_formatting[node_formatting_index] {
-                    Element(ref h, ref t) => {
-                        assert!(self.sink.same_node(h, &node));
-                        t.clone()
-                    },
-                    Marker => panic!("Found marker during adoption agency"),
-                };
-                // FIXME: Is there a way to avoid cloning the attributes twice here (once on their
-                // own, once as part of t.clone() above)?
-                let new_element = create_element(
-                    &mut self.sink,
-                    QualName::new(None, ns!(html), tag.name.clone()),
-                    tag.attrs.clone(),
-                );
-                self.open_elems[node_index] = new_element.clone();
-                self.active_formatting[node_formatting_index] = Element(new_element.clone(), tag);
-                node = new_element;
-
-                // 13.8.
-                if self.sink.same_node(&last_node, &furthest_block) {
-                    bookmark = Bookmark::InsertAfter(node.clone());
-                }
-
-                // 13.9.
-                self.sink.remove_from_parent(&last_node);
-                self.sink.append(&node, AppendNode(last_node.clone()));
-
-                // 13.10.
-                last_node = node.clone();
-
-                // 13.11.
-            }
-
-            // 14.
-            self.sink.remove_from_parent(&last_node);
-            self.insert_appropriately(AppendNode(last_node.clone()), Some(common_ancestor));
-
-            // 15.
-            // FIXME: Is there a way to avoid cloning the attributes twice here (once on their own,
-            // once as part of t.clone() above)?
-            let new_element = create_element(
-                &mut self.sink,
-                QualName::new(None, ns!(html), fmt_elem_tag.name.clone()),
-                fmt_elem_tag.attrs.clone(),
-            );
-            let new_entry = Element(new_element.clone(), fmt_elem_tag);
-
-            // 16.
-            self.sink.reparent_children(&furthest_block, &new_element);
-
-            // 17.
-            self.sink
-                .append(&furthest_block, AppendNode(new_element.clone()));
-
-            // 18.
-            // FIXME: We could probably get rid of the position_in_active_formatting() calls here
-            // if we had a more clever Bookmark representation.
-            match bookmark {
-                Bookmark::Replace(to_replace) => {
-                    let index = self
-                        .position_in_active_formatting(&to_replace)
-                        .expect("bookmark not found in active formatting elements");
-                    self.active_formatting[index] = new_entry;
-                },
-                Bookmark::InsertAfter(previous) => {
-                    let index = self
-                        .position_in_active_formatting(&previous)
-                        .expect("bookmark not found in active formatting elements") +
-                        1;
-                    self.active_formatting.insert(index, new_entry);
-                    let old_index = self
-                        .position_in_active_formatting(&fmt_elem)
-                        .expect("formatting element not found in active formatting elements");
-                    self.active_formatting.remove(old_index);
-                },
-            }
-
-            // 19.
-            self.remove_from_stack(&fmt_elem);
-            let new_furthest_block_index = self
-                .open_elems
-                .iter()
-                .position(|n| self.sink.same_node(n, &furthest_block))
-                .expect("furthest block missing from open element stack");
-            self.open_elems
-                .insert(new_furthest_block_index + 1, new_element);
-
-            // 20.
-        }
-    }
-
-    fn push(&mut self, elem: &Handle) {
-        self.open_elems.push(elem.clone());
-    }
-
-    fn pop(&mut self) -> Handle {
-        let elem = self.open_elems.pop().expect("no current element");
-        self.sink.pop(&elem);
-        elem
-    }
-
-    fn remove_from_stack(&mut self, elem: &Handle) {
-        let sink = &mut self.sink;
-        let position = self
-            .open_elems
-            .iter()
-            .rposition(|x| sink.same_node(elem, &x));
-        if let Some(position) = position {
-            self.open_elems.remove(position);
-            sink.pop(elem);
-        }
-    }
-
-    fn is_marker_or_open(&self, entry: &FormatEntry<Handle>) -> bool {
-        match *entry {
-            Marker => true,
-            Element(ref node, _) => self
-                .open_elems
-                .iter()
-                .rev()
-                .any(|n| self.sink.same_node(&n, &node)),
-        }
-    }
-
-    /// Reconstruct the active formatting elements.
-    fn reconstruct_formatting(&mut self) {
-        {
-            let last = unwrap_or_return!(self.active_formatting.last(), ());
-            if self.is_marker_or_open(last) {
-                return;
-            }
-        }
-
-        let mut entry_index = self.active_formatting.len() - 1;
-        loop {
-            if entry_index == 0 {
-                break;
-            }
-            entry_index -= 1;
-            if self.is_marker_or_open(&self.active_formatting[entry_index]) {
-                entry_index += 1;
-                break;
-            }
-        }
-
-        loop {
-            let tag = match self.active_formatting[entry_index] {
-                Element(_, ref t) => t.clone(),
-                Marker => panic!("Found marker during formatting element reconstruction"),
-            };
-
-            // FIXME: Is there a way to avoid cloning the attributes twice here (once on their own,
-            // once as part of t.clone() above)?
-            let new_element =
-                self.insert_element(Push, ns!(html), tag.name.clone(), tag.attrs.clone());
-            self.active_formatting[entry_index] = Element(new_element, tag);
-            if entry_index == self.active_formatting.len() - 1 {
-                break;
-            }
-            entry_index += 1;
-        }
-    }
-
-    /// Get the first element on the stack, which will be the <html> element.
-    fn html_elem(&self) -> &Handle {
-        &self.open_elems[0]
-    }
-
-    /// Get the second element on the stack, if it's a HTML body element.
-    fn body_elem(&self) -> Option<&Handle> {
-        if self.open_elems.len() <= 1 {
-            return None;
-        }
-
-        let node = &self.open_elems[1];
-        if self.html_elem_named(node, local_name!("body")) {
-            Some(node)
-        } else {
-            None
-        }
-    }
-
-    /// Signal an error depending on the state of the stack of open elements at
-    /// the end of the body.
-    fn check_body_end(&mut self) {
-        declare_tag_set!(body_end_ok =
-            "dd" "dt" "li" "optgroup" "option" "p" "rp" "rt" "tbody" "td" "tfoot" "th"
-            "thead" "tr" "body" "html");
-
-        for elem in self.open_elems.iter() {
-            let error;
-            {
-                let name = self.sink.elem_name(elem);
-                if body_end_ok(name) {
-                    continue;
-                }
-                error = format_if!(
-                    self.opts.exact_errors,
-                    "Unexpected open tag at end of body",
-                    "Unexpected open tag {:?} at end of body",
-                    name
-                );
-            }
-            self.sink.parse_error(error);
-            // FIXME: Do we keep checking after finding one bad tag?
-            // The spec suggests not.
-            return;
-        }
-    }
-
-    fn in_scope<TagSet, Pred>(&self, scope: TagSet, pred: Pred) -> bool
-    where
-        TagSet: Fn(ExpandedName) -> bool,
-        Pred: Fn(Handle) -> bool,
-    {
-        for node in self.open_elems.iter().rev() {
-            if pred(node.clone()) {
-                return true;
-            }
-            if scope(self.sink.elem_name(node)) {
-                return false;
-            }
-        }
-
-        // supposed to be impossible, because <html> is always in scope
-
-        false
-    }
-
-    fn elem_in<TagSet>(&self, elem: &Handle, set: TagSet) -> bool
-    where
-        TagSet: Fn(ExpandedName) -> bool,
-    {
-        set(self.sink.elem_name(elem))
-    }
-
-    fn html_elem_named(&self, elem: &Handle, name: LocalName) -> bool {
-        let expanded = self.sink.elem_name(elem);
-        *expanded.ns == ns!(html) && *expanded.local == name
-    }
-
-    fn in_html_elem_named(&self, name: LocalName) -> bool {
-        self.open_elems
-            .iter()
-            .any(|elem| self.html_elem_named(elem, name.clone()))
-    }
-
-    fn current_node_named(&self, name: LocalName) -> bool {
-        self.html_elem_named(self.current_node(), name)
-    }
-
-    fn in_scope_named<TagSet>(&self, scope: TagSet, name: LocalName) -> bool
-    where
-        TagSet: Fn(ExpandedName) -> bool,
-    {
-        self.in_scope(scope, |elem| self.html_elem_named(&elem, name.clone()))
-    }
-
-    //§ closing-elements-that-have-implied-end-tags
-    fn generate_implied_end<TagSet>(&mut self, set: TagSet)
-    where
-        TagSet: Fn(ExpandedName) -> bool,
-    {
-        loop {
-            {
-                let elem = unwrap_or_return!(self.open_elems.last(), ());
-                let nsname = self.sink.elem_name(elem);
-                if !set(nsname) {
-                    return;
-                }
-            }
-            self.pop();
-        }
-    }
-
-    fn generate_implied_end_except(&mut self, except: LocalName) {
-        self.generate_implied_end(|p| {
-            if *p.ns == ns!(html) && *p.local == except {
-                false
-            } else {
-                cursory_implied_end(p)
-            }
-        });
-    }
-    //§ END
-
-    // Pop elements until the current element is in the set.
-    fn pop_until_current<TagSet>(&mut self, pred: TagSet)
-    where
-        TagSet: Fn(ExpandedName) -> bool,
-    {
-        loop {
-            if self.current_node_in(|x| pred(x)) {
-                break;
-            }
-            self.open_elems.pop();
-        }
-    }
-
-    // Pop elements until an element from the set has been popped.  Returns the
-    // number of elements popped.
-    fn pop_until<P>(&mut self, pred: P) -> usize
-    where
-        P: Fn(ExpandedName) -> bool,
-    {
-        let mut n = 0;
-        loop {
-            n += 1;
-            match self.open_elems.pop() {
-                None => break,
-                Some(elem) => {
-                    if pred(self.sink.elem_name(&elem)) {
-                        break;
-                    }
-                },
-            }
-        }
-        n
-    }
-
-    fn pop_until_named(&mut self, name: LocalName) -> usize {
-        self.pop_until(|p| *p.ns == ns!(html) && *p.local == name)
-    }
-
-    // Pop elements until one with the specified name has been popped.
-    // Signal an error if it was not the first one.
-    fn expect_to_close(&mut self, name: LocalName) {
-        if self.pop_until_named(name.clone()) != 1 {
-            self.sink.parse_error(format_if!(
-                self.opts.exact_errors,
-                "Unexpected open element",
-                "Unexpected open element while closing {:?}",
-                name
-            ));
-        }
-    }
-
-    fn close_p_element(&mut self) {
-        declare_tag_set!(implied = [cursory_implied_end] - "p");
-        self.generate_implied_end(implied);
-        self.expect_to_close(local_name!("p"));
-    }
-
-    fn close_p_element_in_button_scope(&mut self) {
-        if self.in_scope_named(button_scope, local_name!("p")) {
-            self.close_p_element();
-        }
-    }
-
-    // Check <input> tags for type=hidden
-    fn is_type_hidden(&self, tag: &Tag) -> bool {
-        match tag
-            .attrs
-            .iter()
-            .find(|&at| at.name.expanded() == expanded_name!("", "type"))
-        {
-            None => false,
-            Some(at) => (&*at.value).eq_ignore_ascii_case("hidden"),
-        }
-    }
-
-    fn foster_parent_in_body(&mut self, token: Token) -> ProcessResult<Handle> {
-        warn!("foster parenting not implemented");
-        self.foster_parenting = true;
-        let res = self.step(InBody, token);
-        // FIXME: what if res is Reprocess?
-        self.foster_parenting = false;
-        res
-    }
-
-    fn process_chars_in_table(&mut self, token: Token) -> ProcessResult<Handle> {
-        declare_tag_set!(table_outer = "table" "tbody" "tfoot" "thead" "tr");
-        if self.current_node_in(table_outer) {
-            assert!(self.pending_table_text.is_empty());
-            self.orig_mode = Some(self.mode);
-            Reprocess(InTableText, token)
-        } else {
-            self.sink.parse_error(format_if!(
-                self.opts.exact_errors,
-                "Unexpected characters in table",
-                "Unexpected characters {} in table",
-                to_escaped_string(&token)
-            ));
-            self.foster_parent_in_body(token)
-        }
-    }
-
-    // https://html.spec.whatwg.org/multipage/#reset-the-insertion-mode-appropriately
-    fn reset_insertion_mode(&mut self) -> InsertionMode {
-        for (i, mut node) in self.open_elems.iter().enumerate().rev() {
-            let last = i == 0usize;
-            if let (true, Some(ctx)) = (last, self.context_elem.as_ref()) {
-                node = ctx;
-            }
-            let name = match self.sink.elem_name(node) {
-                ExpandedName {
-                    ns: &ns!(html),
-                    local,
-                } => local,
-                _ => continue,
-            };
-            match *name {
-                local_name!("select") => {
-                    for ancestor in self.open_elems[0..i].iter().rev() {
-                        if self.html_elem_named(ancestor, local_name!("template")) {
-                            return InSelect;
-                        } else if self.html_elem_named(ancestor, local_name!("table")) {
-                            return InSelectInTable;
-                        }
-                    }
-                    return InSelect;
-                },
-                local_name!("td") | local_name!("th") => {
-                    if !last {
-                        return InCell;
-                    }
-                },
-                local_name!("tr") => return InRow,
-                local_name!("tbody") | local_name!("thead") | local_name!("tfoot") => {
-                    return InTableBody;
-                },
-                local_name!("caption") => return InCaption,
-                local_name!("colgroup") => return InColumnGroup,
-                local_name!("table") => return InTable,
-                local_name!("template") => return *self.template_modes.last().unwrap(),
-                local_name!("head") => {
-                    if !last {
-                        return InHead;
-                    }
-                },
-                local_name!("body") => return InBody,
-                local_name!("frameset") => return InFrameset,
-                local_name!("html") => match self.head_elem {
-                    None => return BeforeHead,
-                    Some(_) => return AfterHead,
-                },
-
-                _ => (),
-            }
-        }
-        InBody
-    }
-
-    fn close_the_cell(&mut self) {
-        self.generate_implied_end(cursory_implied_end);
-        if self.pop_until(td_th) != 1 {
-            self.sink
-                .parse_error(Borrowed("expected to close <td> or <th> with cell"));
-        }
-        self.clear_active_formatting_to_marker();
-    }
-
-    fn append_text(&mut self, text: StrTendril) -> ProcessResult<Handle> {
-        self.insert_appropriately(AppendText(text), None);
-        Done
-    }
-
-    fn append_comment(&mut self, text: StrTendril) -> ProcessResult<Handle> {
-        let comment = self.sink.create_comment(text);
-        self.insert_appropriately(AppendNode(comment), None);
-        Done
-    }
-
-    fn append_comment_to_doc(&mut self, text: StrTendril) -> ProcessResult<Handle> {
-        let comment = self.sink.create_comment(text);
-        self.sink.append(&self.doc_handle, AppendNode(comment));
-        Done
-    }
-
-    fn append_comment_to_html(&mut self, text: StrTendril) -> ProcessResult<Handle> {
-        let target = html_elem(&self.open_elems);
-        let comment = self.sink.create_comment(text);
-        self.sink.append(target, AppendNode(comment));
-        Done
-    }
-
-    //§ creating-and-inserting-nodes
-    fn create_root(&mut self, attrs: Vec<Attribute>) {
-        let elem = create_element(
-            &mut self.sink,
-            QualName::new(None, ns!(html), local_name!("html")),
-            attrs,
-        );
-        self.push(&elem);
-        self.sink.append(&self.doc_handle, AppendNode(elem));
-        // FIXME: application cache selection algorithm
-    }
-
-    // https://html.spec.whatwg.org/multipage/#create-an-element-for-the-token
-    fn insert_element(
-        &mut self,
-        push: PushFlag,
-        ns: Namespace,
-        name: LocalName,
-        attrs: Vec<Attribute>,
-    ) -> Handle {
-        declare_tag_set!(form_associatable =
-            "button" "fieldset" "input" "object"
-            "output" "select" "textarea" "img");
-
-        declare_tag_set!(listed = [form_associatable] - "img");
-
-        // Step 7.
-        let qname = QualName::new(None, ns, name);
-        let elem = create_element(&mut self.sink, qname.clone(), attrs.clone());
-
-        let insertion_point = self.appropriate_place_for_insertion(None);
-        let (node1, node2) = match insertion_point {
-            LastChild(ref p) | BeforeSibling(ref p) => (p.clone(), None),
-            TableFosterParenting {
-                ref element,
-                ref prev_element,
-            } => (element.clone(), Some(prev_element.clone())),
-        };
-
-        // Step 12.
-        if form_associatable(qname.expanded()) &&
-            self.form_elem.is_some() &&
-            !self.in_html_elem_named(local_name!("template")) &&
-            !(listed(qname.expanded()) &&
-                attrs
-                    .iter()
-                    .any(|a| a.name.expanded() == expanded_name!("", "form")))
-        {
-            let form = self.form_elem.as_ref().unwrap().clone();
-            let node2 = match node2 {
-                Some(ref n) => Some(n),
-                None => None,
-            };
-            self.sink.associate_with_form(&elem, &form, (&node1, node2));
-        }
-
-        self.insert_at(insertion_point, AppendNode(elem.clone()));
-
-        match push {
-            Push => self.push(&elem),
-            NoPush => (),
-        }
-        // FIXME: Remove from the stack if we can't append?
-        elem
-    }
-
-    fn insert_element_for(&mut self, tag: Tag) -> Handle {
-        self.insert_element(Push, ns!(html), tag.name, tag.attrs)
-    }
-
-    fn insert_and_pop_element_for(&mut self, tag: Tag) -> Handle {
-        self.insert_element(NoPush, ns!(html), tag.name, tag.attrs)
-    }
-
-    fn insert_phantom(&mut self, name: LocalName) -> Handle {
-        self.insert_element(Push, ns!(html), name, vec![])
-    }
-    //§ END
-
-    fn create_formatting_element_for(&mut self, tag: Tag) -> Handle {
-        // FIXME: This really wants unit tests.
-        let mut first_match = None;
-        let mut matches = 0usize;
-        for (i, _, old_tag) in self.active_formatting_end_to_marker() {
-            if tag.equiv_modulo_attr_order(old_tag) {
-                first_match = Some(i);
-                matches += 1;
-            }
-        }
-
-        if matches >= 3 {
-            self.active_formatting
-                .remove(first_match.expect("matches with no index"));
-        }
-
-        let elem = self.insert_element(Push, ns!(html), tag.name.clone(), tag.attrs.clone());
-        self.active_formatting.push(Element(elem.clone(), tag));
-        elem
-    }
-
-    fn clear_active_formatting_to_marker(&mut self) {
-        loop {
-            match self.active_formatting.pop() {
-                None | Some(Marker) => break,
-                _ => (),
-            }
-        }
-    }
-
-    fn process_end_tag_in_body(&mut self, tag: Tag) {
-        // Look back for a matching open element.
-        let mut match_idx = None;
-        for (i, elem) in self.open_elems.iter().enumerate().rev() {
-            if self.html_elem_named(elem, tag.name.clone()) {
-                match_idx = Some(i);
-                break;
-            }
-
-            if self.elem_in(elem, special_tag) {
-                self.sink
-                    .parse_error(Borrowed("Found special tag while closing generic tag"));
-                return;
-            }
-        }
-
-        // Can't use unwrap_or_return!() due to rust-lang/rust#16617.
-        let match_idx = match match_idx {
-            None => {
-                // I believe this is impossible, because the root
-                // <html> element is in special_tag.
-                self.unexpected(&tag);
-                return;
-            },
-            Some(x) => x,
-        };
-
-        self.generate_implied_end_except(tag.name.clone());
-
-        if match_idx != self.open_elems.len() - 1 {
-            // mis-nested tags
-            self.unexpected(&tag);
-        }
-        self.open_elems.truncate(match_idx);
-    }
-
-    fn handle_misnested_a_tags(&mut self, tag: &Tag) {
-        let node = unwrap_or_return!(
-            self.active_formatting_end_to_marker()
-                .filter(|&(_, n, _)| self.html_elem_named(n, local_name!("a")))
-                .next()
-                .map(|(_, n, _)| n.clone()),
-            ()
-        );
-
-        self.unexpected(tag);
-        self.adoption_agency(local_name!("a"));
-        self.position_in_active_formatting(&node)
-            .map(|index| self.active_formatting.remove(index));
-        self.remove_from_stack(&node);
-    }
-
-    //§ tree-construction
-    fn is_foreign(&mut self, token: &Token) -> bool {
-        if let EOFToken = *token {
-            return false;
-        }
-
-        if self.open_elems.is_empty() {
-            return false;
-        }
-
-        let name = self.sink.elem_name(self.adjusted_current_node());
-        if let ns!(html) = *name.ns {
-            return false;
-        }
-
-        if mathml_text_integration_point(name) {
-            match *token {
-                CharacterTokens(..) | NullCharacterToken => return false,
-                TagToken(Tag {
-                    kind: StartTag,
-                    ref name,
-                    ..
-                }) if !matches!(*name, local_name!("mglyph") | local_name!("malignmark")) => {
-                    return false;
-                },
-                _ => (),
-            }
-        }
-
-        if svg_html_integration_point(name) {
-            match *token {
-                CharacterTokens(..) | NullCharacterToken => return false,
-                TagToken(Tag { kind: StartTag, .. }) => return false,
-                _ => (),
-            }
-        }
-
-        if let expanded_name!(mathml "annotation-xml") = name {
-            match *token {
-                TagToken(Tag {
-                    kind: StartTag,
-                    name: local_name!("svg"),
-                    ..
-                }) => return false,
-                CharacterTokens(..) | NullCharacterToken | TagToken(Tag { kind: StartTag, .. }) => {
-                    return !self
-                        .sink
-                        .is_mathml_annotation_xml_integration_point(self.adjusted_current_node());
-                },
-                _ => {},
-            };
-        }
-
-        true
-    }
-    //§ END
-
-    fn enter_foreign(&mut self, mut tag: Tag, ns: Namespace) -> ProcessResult<Handle> {
-        match ns {
-            ns!(mathml) => self.adjust_mathml_attributes(&mut tag),
-            ns!(svg) => self.adjust_svg_attributes(&mut tag),
-            _ => (),
-        }
-        self.adjust_foreign_attributes(&mut tag);
-
-        if tag.self_closing {
-            self.insert_element(NoPush, ns, tag.name, tag.attrs);
-            DoneAckSelfClosing
-        } else {
-            self.insert_element(Push, ns, tag.name, tag.attrs);
-            Done
-        }
-    }
-
-    fn adjust_svg_tag_name(&mut self, tag: &mut Tag) {
-        let Tag { ref mut name, .. } = *tag;
-        match *name {
-            local_name!("altglyph") => *name = local_name!("altGlyph"),
-            local_name!("altglyphdef") => *name = local_name!("altGlyphDef"),
-            local_name!("altglyphitem") => *name = local_name!("altGlyphItem"),
-            local_name!("animatecolor") => *name = local_name!("animateColor"),
-            local_name!("animatemotion") => *name = local_name!("animateMotion"),
-            local_name!("animatetransform") => *name = local_name!("animateTransform"),
-            local_name!("clippath") => *name = local_name!("clipPath"),
-            local_name!("feblend") => *name = local_name!("feBlend"),
-            local_name!("fecolormatrix") => *name = local_name!("feColorMatrix"),
-            local_name!("fecomponenttransfer") => *name = local_name!("feComponentTransfer"),
-            local_name!("fecomposite") => *name = local_name!("feComposite"),
-            local_name!("feconvolvematrix") => *name = local_name!("feConvolveMatrix"),
-            local_name!("fediffuselighting") => *name = local_name!("feDiffuseLighting"),
-            local_name!("fedisplacementmap") => *name = local_name!("feDisplacementMap"),
-            local_name!("fedistantlight") => *name = local_name!("feDistantLight"),
-            local_name!("fedropshadow") => *name = local_name!("feDropShadow"),
-            local_name!("feflood") => *name = local_name!("feFlood"),
-            local_name!("fefunca") => *name = local_name!("feFuncA"),
-            local_name!("fefuncb") => *name = local_name!("feFuncB"),
-            local_name!("fefuncg") => *name = local_name!("feFuncG"),
-            local_name!("fefuncr") => *name = local_name!("feFuncR"),
-            local_name!("fegaussianblur") => *name = local_name!("feGaussianBlur"),
-            local_name!("feimage") => *name = local_name!("feImage"),
-            local_name!("femerge") => *name = local_name!("feMerge"),
-            local_name!("femergenode") => *name = local_name!("feMergeNode"),
-            local_name!("femorphology") => *name = local_name!("feMorphology"),
-            local_name!("feoffset") => *name = local_name!("feOffset"),
-            local_name!("fepointlight") => *name = local_name!("fePointLight"),
-            local_name!("fespecularlighting") => *name = local_name!("feSpecularLighting"),
-            local_name!("fespotlight") => *name = local_name!("feSpotLight"),
-            local_name!("fetile") => *name = local_name!("feTile"),
-            local_name!("feturbulence") => *name = local_name!("feTurbulence"),
-            local_name!("foreignobject") => *name = local_name!("foreignObject"),
-            local_name!("glyphref") => *name = local_name!("glyphRef"),
-            local_name!("lineargradient") => *name = local_name!("linearGradient"),
-            local_name!("radialgradient") => *name = local_name!("radialGradient"),
-            local_name!("textpath") => *name = local_name!("textPath"),
-            _ => (),
-        }
-    }
-
-    fn adjust_attributes<F>(&mut self, tag: &mut Tag, mut map: F)
-    where
-        F: FnMut(LocalName) -> Option<QualName>,
-    {
-        for &mut Attribute { ref mut name, .. } in &mut tag.attrs {
-            if let Some(replacement) = map(name.local.clone()) {
-                *name = replacement;
-            }
-        }
-    }
-
-    fn adjust_svg_attributes(&mut self, tag: &mut Tag) {
-        self.adjust_attributes(tag, |k| match k {
-            local_name!("attributename") => Some(qualname!("", "attributeName")),
-            local_name!("attributetype") => Some(qualname!("", "attributeType")),
-            local_name!("basefrequency") => Some(qualname!("", "baseFrequency")),
-            local_name!("baseprofile") => Some(qualname!("", "baseProfile")),
-            local_name!("calcmode") => Some(qualname!("", "calcMode")),
-            local_name!("clippathunits") => Some(qualname!("", "clipPathUnits")),
-            local_name!("diffuseconstant") => Some(qualname!("", "diffuseConstant")),
-            local_name!("edgemode") => Some(qualname!("", "edgeMode")),
-            local_name!("filterunits") => Some(qualname!("", "filterUnits")),
-            local_name!("glyphref") => Some(qualname!("", "glyphRef")),
-            local_name!("gradienttransform") => Some(qualname!("", "gradientTransform")),
-            local_name!("gradientunits") => Some(qualname!("", "gradientUnits")),
-            local_name!("kernelmatrix") => Some(qualname!("", "kernelMatrix")),
-            local_name!("kernelunitlength") => Some(qualname!("", "kernelUnitLength")),
-            local_name!("keypoints") => Some(qualname!("", "keyPoints")),
-            local_name!("keysplines") => Some(qualname!("", "keySplines")),
-            local_name!("keytimes") => Some(qualname!("", "keyTimes")),
-            local_name!("lengthadjust") => Some(qualname!("", "lengthAdjust")),
-            local_name!("limitingconeangle") => Some(qualname!("", "limitingConeAngle")),
-            local_name!("markerheight") => Some(qualname!("", "markerHeight")),
-            local_name!("markerunits") => Some(qualname!("", "markerUnits")),
-            local_name!("markerwidth") => Some(qualname!("", "markerWidth")),
-            local_name!("maskcontentunits") => Some(qualname!("", "maskContentUnits")),
-            local_name!("maskunits") => Some(qualname!("", "maskUnits")),
-            local_name!("numoctaves") => Some(qualname!("", "numOctaves")),
-            local_name!("pathlength") => Some(qualname!("", "pathLength")),
-            local_name!("patterncontentunits") => Some(qualname!("", "patternContentUnits")),
-            local_name!("patterntransform") => Some(qualname!("", "patternTransform")),
-            local_name!("patternunits") => Some(qualname!("", "patternUnits")),
-            local_name!("pointsatx") => Some(qualname!("", "pointsAtX")),
-            local_name!("pointsaty") => Some(qualname!("", "pointsAtY")),
-            local_name!("pointsatz") => Some(qualname!("", "pointsAtZ")),
-            local_name!("preservealpha") => Some(qualname!("", "preserveAlpha")),
-            local_name!("preserveaspectratio") => Some(qualname!("", "preserveAspectRatio")),
-            local_name!("primitiveunits") => Some(qualname!("", "primitiveUnits")),
-            local_name!("refx") => Some(qualname!("", "refX")),
-            local_name!("refy") => Some(qualname!("", "refY")),
-            local_name!("repeatcount") => Some(qualname!("", "repeatCount")),
-            local_name!("repeatdur") => Some(qualname!("", "repeatDur")),
-            local_name!("requiredextensions") => Some(qualname!("", "requiredExtensions")),
-            local_name!("requiredfeatures") => Some(qualname!("", "requiredFeatures")),
-            local_name!("specularconstant") => Some(qualname!("", "specularConstant")),
-            local_name!("specularexponent") => Some(qualname!("", "specularExponent")),
-            local_name!("spreadmethod") => Some(qualname!("", "spreadMethod")),
-            local_name!("startoffset") => Some(qualname!("", "startOffset")),
-            local_name!("stddeviation") => Some(qualname!("", "stdDeviation")),
-            local_name!("stitchtiles") => Some(qualname!("", "stitchTiles")),
-            local_name!("surfacescale") => Some(qualname!("", "surfaceScale")),
-            local_name!("systemlanguage") => Some(qualname!("", "systemLanguage")),
-            local_name!("tablevalues") => Some(qualname!("", "tableValues")),
-            local_name!("targetx") => Some(qualname!("", "targetX")),
-            local_name!("targety") => Some(qualname!("", "targetY")),
-            local_name!("textlength") => Some(qualname!("", "textLength")),
-            local_name!("viewbox") => Some(qualname!("", "viewBox")),
-            local_name!("viewtarget") => Some(qualname!("", "viewTarget")),
-            local_name!("xchannelselector") => Some(qualname!("", "xChannelSelector")),
-            local_name!("ychannelselector") => Some(qualname!("", "yChannelSelector")),
-            local_name!("zoomandpan") => Some(qualname!("", "zoomAndPan")),
-            _ => None,
-        });
-    }
-
-    fn adjust_mathml_attributes(&mut self, tag: &mut Tag) {
-        self.adjust_attributes(tag, |k| match k {
-            local_name!("definitionurl") => Some(qualname!("", "definitionURL")),
-            _ => None,
-        });
-    }
-
-    fn adjust_foreign_attributes(&mut self, tag: &mut Tag) {
-        self.adjust_attributes(tag, |k| match k {
-            local_name!("xlink:actuate") => Some(qualname!("xlink" xlink "actuate")),
-            local_name!("xlink:arcrole") => Some(qualname!("xlink" xlink "arcrole")),
-            local_name!("xlink:href") => Some(qualname!("xlink" xlink "href")),
-            local_name!("xlink:role") => Some(qualname!("xlink" xlink "role")),
-            local_name!("xlink:show") => Some(qualname!("xlink" xlink "show")),
-            local_name!("xlink:title") => Some(qualname!("xlink" xlink "title")),
-            local_name!("xlink:type") => Some(qualname!("xlink" xlink "type")),
-            local_name!("xml:base") => Some(qualname!("xml" xml "base")),
-            local_name!("xml:lang") => Some(qualname!("xml" xml "lang")),
-            local_name!("xml:space") => Some(qualname!("xml" xml "space")),
-            local_name!("xmlns") => Some(qualname!("" xmlns "xmlns")),
-            local_name!("xmlns:xlink") => Some(qualname!("xmlns" xmlns "xlink")),
-            _ => None,
-        });
-    }
-
-    fn foreign_start_tag(&mut self, mut tag: Tag) -> ProcessResult<Handle> {
-        let current_ns = self.sink.elem_name(self.adjusted_current_node()).ns.clone();
-        match current_ns {
-            ns!(mathml) => self.adjust_mathml_attributes(&mut tag),
-            ns!(svg) => {
-                self.adjust_svg_tag_name(&mut tag);
-                self.adjust_svg_attributes(&mut tag);
-            },
-            _ => (),
-        }
-        self.adjust_foreign_attributes(&mut tag);
-        if tag.self_closing {
-            // FIXME(#118): <script /> in SVG
-            self.insert_element(NoPush, current_ns, tag.name, tag.attrs);
-            DoneAckSelfClosing
-        } else {
-            self.insert_element(Push, current_ns, tag.name, tag.attrs);
-            Done
-        }
-    }
-
-    fn unexpected_start_tag_in_foreign_content(&mut self, tag: Tag) -> ProcessResult<Handle> {
-        self.unexpected(&tag);
-        if self.is_fragment() {
-            self.foreign_start_tag(tag)
-        } else {
-            self.pop();
-            while !self.current_node_in(|n| {
-                *n.ns == ns!(html) ||
-                    mathml_text_integration_point(n) ||
-                    svg_html_integration_point(n)
-            }) {
-                self.pop();
-            }
-            ReprocessForeign(TagToken(tag))
-        }
-    }
-}
diff --git a/src/tree_builder/rules.rs b/src/tree_builder/rules.rs
deleted file mode 100644
index bdc8afd..0000000
--- a/src/tree_builder/rules.rs
+++ /dev/null
@@ -1,1449 +0,0 @@
-// Copyright 2014-2017 The html5ever Project Developers. See the
-// COPYRIGHT file at the top-level directory of this distribution.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-// The tree builder rules, as a single, enormous nested match expression.
-
-use markup5ever::{expanded_name, local_name, namespace_prefix, namespace_url, ns};
-use crate::tokenizer::states::{Plaintext, Rawtext, Rcdata, ScriptData};
-use crate::tree_builder::tag_sets::*;
-use crate::tree_builder::types::*;
-
-use std::borrow::ToOwned;
-
-use crate::tendril::SliceExt;
-
-fn any_not_whitespace(x: &StrTendril) -> bool {
-    // FIXME: this might be much faster as a byte scan
-    x.chars().any(|c| !is_ascii_whitespace(c))
-}
-
-fn current_node<Handle>(open_elems: &[Handle]) -> &Handle {
-    open_elems.last().expect("no current element")
-}
-
-#[doc(hidden)]
-impl<Handle, Sink> TreeBuilder<Handle, Sink>
-where
-    Handle: Clone,
-    Sink: TreeSink<Handle = Handle>,
-{
-    fn step(&mut self, mode: InsertionMode, token: Token) -> ProcessResult<Handle> {
-        self.debug_step(mode, &token);
-
-        match mode {
-            //§ the-initial-insertion-mode
-            Initial => match_token!(token {
-                CharacterTokens(NotSplit, text) => SplitWhitespace(text),
-                CharacterTokens(Whitespace, _) => Done,
-                CommentToken(text) => self.append_comment_to_doc(text),
-                token => {
-                    if !self.opts.iframe_srcdoc {
-                        self.unexpected(&token);
-                        self.set_quirks_mode(Quirks);
-                    }
-                    Reprocess(BeforeHtml, token)
-                }
-            }),
-
-            //§ the-before-html-insertion-mode
-            BeforeHtml => match_token!(token {
-                CharacterTokens(NotSplit, text) => SplitWhitespace(text),
-                CharacterTokens(Whitespace, _) => Done,
-                CommentToken(text) => self.append_comment_to_doc(text),
-
-                tag @ <html> => {
-                    self.create_root(tag.attrs);
-                    self.mode = BeforeHead;
-                    Done
-                }
-
-                </head> </body> </html> </br> => else,
-
-                tag @ </_> => self.unexpected(&tag),
-
-                token => {
-                    self.create_root(vec!());
-                    Reprocess(BeforeHead, token)
-                }
-            }),
-
-            //§ the-before-head-insertion-mode
-            BeforeHead => match_token!(token {
-                CharacterTokens(NotSplit, text) => SplitWhitespace(text),
-                CharacterTokens(Whitespace, _) => Done,
-                CommentToken(text) => self.append_comment(text),
-
-                <html> => self.step(InBody, token),
-
-                tag @ <head> => {
-                    self.head_elem = Some(self.insert_element_for(tag));
-                    self.mode = InHead;
-                    Done
-                }
-
-                </head> </body> </html> </br> => else,
-
-                tag @ </_> => self.unexpected(&tag),
-
-                token => {
-                    self.head_elem = Some(self.insert_phantom(local_name!("head")));
-                    Reprocess(InHead, token)
-                }
-            }),
-
-            //§ parsing-main-inhead
-            InHead => match_token!(token {
-                CharacterTokens(NotSplit, text) => SplitWhitespace(text),
-                CharacterTokens(Whitespace, text) => self.append_text(text),
-                CommentToken(text) => self.append_comment(text),
-
-                <html> => self.step(InBody, token),
-
-                tag @ <base> <basefont> <bgsound> <link> <meta> => {
-                    // FIXME: handle <meta charset=...> and <meta http-equiv="Content-Type">
-                    self.insert_and_pop_element_for(tag);
-                    DoneAckSelfClosing
-                }
-
-                tag @ <title> => {
-                    self.parse_raw_data(tag, Rcdata)
-                }
-
-                tag @ <noframes> <style> <noscript> => {
-                    if (!self.opts.scripting_enabled) && (tag.name == local_name!("noscript")) {
-                        self.insert_element_for(tag);
-                        self.mode = InHeadNoscript;
-                        Done
-                    } else {
-                        self.parse_raw_data(tag, Rawtext)
-                    }
-                }
-
-                tag @ <script> => {
-                    let elem = create_element(
-                        &mut self.sink, QualName::new(None, ns!(html), local_name!("script")),
-                        tag.attrs);
-                    if self.is_fragment() {
-                        self.sink.mark_script_already_started(&elem);
-                    }
-                    self.insert_appropriately(AppendNode(elem.clone()), None);
-                    self.open_elems.push(elem);
-                    self.to_raw_text_mode(ScriptData)
-                }
-
-                </head> => {
-                    self.pop();
-                    self.mode = AfterHead;
-                    Done
-                }
-
-                </body> </html> </br> => else,
-
-                tag @ <template> => {
-                    self.insert_element_for(tag);
-                    self.active_formatting.push(Marker);
-                    self.frameset_ok = false;
-                    self.mode = InTemplate;
-                    self.template_modes.push(InTemplate);
-                    Done
-                }
-
-                tag @ </template> => {
-                    if !self.in_html_elem_named(local_name!("template")) {
-                        self.unexpected(&tag);
-                    } else {
-                        self.generate_implied_end(thorough_implied_end);
-                        self.expect_to_close(local_name!("template"));
-                        self.clear_active_formatting_to_marker();
-                        self.template_modes.pop();
-                        self.mode = self.reset_insertion_mode();
-                    }
-                    Done
-                }
-
-                <head> => self.unexpected(&token),
-                tag @ </_> => self.unexpected(&tag),
-
-                token => {
-                    self.pop();
-                    Reprocess(AfterHead, token)
-                }
-            }),
-
-            //§ parsing-main-inheadnoscript
-            InHeadNoscript => match_token!(token {
-                <html> => self.step(InBody, token),
-
-                </noscript> => {
-                    self.pop();
-                    self.mode = InHead;
-                    Done
-                },
-
-                CharacterTokens(NotSplit, text) => SplitWhitespace(text),
-                CharacterTokens(Whitespace, _) => self.step(InHead, token),
-
-                CommentToken(_) => self.step(InHead, token),
-
-                <basefont> <bgsound> <link> <meta> <noframes> <style>
-                    => self.step(InHead, token),
-
-                </br> => else,
-
-                <head> <noscript> => self.unexpected(&token),
-                tag @ </_> => self.unexpected(&tag),
-
-                token => {
-                    self.unexpected(&token);
-                    self.pop();
-                    Reprocess(InHead, token)
-                },
-            }),
-
-            //§ the-after-head-insertion-mode
-            AfterHead => match_token!(token {
-                CharacterTokens(NotSplit, text) => SplitWhitespace(text),
-                CharacterTokens(Whitespace, text) => self.append_text(text),
-                CommentToken(text) => self.append_comment(text),
-
-                <html> => self.step(InBody, token),
-
-                tag @ <body> => {
-                    self.insert_element_for(tag);
-                    self.frameset_ok = false;
-                    self.mode = InBody;
-                    Done
-                }
-
-                tag @ <frameset> => {
-                    self.insert_element_for(tag);
-                    self.mode = InFrameset;
-                    Done
-                }
-
-                <base> <basefont> <bgsound> <link> <meta>
-                      <noframes> <script> <style> <template> <title> => {
-                    self.unexpected(&token);
-                    let head = self.head_elem.as_ref().expect("no head element").clone();
-                    self.push(&head);
-                    let result = self.step(InHead, token);
-                    self.remove_from_stack(&head);
-                    result
-                }
-
-                </template> => self.step(InHead, token),
-
-                </body> </html> </br> => else,
-
-                <head> => self.unexpected(&token),
-                tag @ </_> => self.unexpected(&tag),
-
-                token => {
-                    self.insert_phantom(local_name!("body"));
-                    Reprocess(InBody, token)
-                }
-            }),
-
-            //§ parsing-main-inbody
-            InBody => match_token!(token {
-                NullCharacterToken => self.unexpected(&token),
-
-                CharacterTokens(_, text) => {
-                    self.reconstruct_formatting();
-                    if any_not_whitespace(&text) {
-                        self.frameset_ok = false;
-                    }
-                    self.append_text(text)
-                }
-
-                CommentToken(text) => self.append_comment(text),
-
-                tag @ <html> => {
-                    self.unexpected(&tag);
-                    if !self.in_html_elem_named(local_name!("template")) {
-                        let top = html_elem(&self.open_elems);
-                        self.sink.add_attrs_if_missing(top, tag.attrs);
-                    }
-                    Done
-                }
-
-                <base> <basefont> <bgsound> <link> <meta> <noframes>
-                  <script> <style> <template> <title> </template> => {
-                    self.step(InHead, token)
-                }
-
-                tag @ <body> => {
-                    self.unexpected(&tag);
-                    match self.body_elem().cloned() {
-                        Some(ref node) if self.open_elems.len() != 1 &&
-                                          !self.in_html_elem_named(local_name!("template")) => {
-                            self.frameset_ok = false;
-                            self.sink.add_attrs_if_missing(node, tag.attrs)
-                        },
-                        _ => {}
-                    }
-                    Done
-                }
-
-                tag @ <frameset> => {
-                    self.unexpected(&tag);
-                    if !self.frameset_ok { return Done; }
-
-                    let body = unwrap_or_return!(self.body_elem(), Done).clone();
-                    self.sink.remove_from_parent(&body);
-
-                    // FIXME: can we get here in the fragment case?
-                    // What to do with the first element then?
-                    self.open_elems.truncate(1);
-                    self.insert_element_for(tag);
-                    self.mode = InFrameset;
-                    Done
-                }
-
-                EOFToken => {
-                    if !self.template_modes.is_empty() {
-                        self.step(InTemplate, token)
-                    } else {
-                        self.check_body_end();
-                        self.stop_parsing()
-                    }
-                }
-
-                </body> => {
-                    if self.in_scope_named(default_scope, local_name!("body")) {
-                        self.check_body_end();
-                        self.mode = AfterBody;
-                    } else {
-                        self.sink.parse_error(Borrowed("</body> with no <body> in scope"));
-                    }
-                    Done
-                }
-
-                </html> => {
-                    if self.in_scope_named(default_scope, local_name!("body")) {
-                        self.check_body_end();
-                        Reprocess(AfterBody, token)
-                    } else {
-                        self.sink.parse_error(Borrowed("</html> with no <body> in scope"));
-                        Done
-                    }
-                }
-
-                tag @ <address> <article> <aside> <blockquote> <center> <details> <dialog>
-                  <dir> <div> <dl> <fieldset> <figcaption> <figure> <footer> <header>
-                  <hgroup> <main> <nav> <ol> <p> <section> <summary> <ul> => {
-                    self.close_p_element_in_button_scope();
-                    self.insert_element_for(tag);
-                    Done
-                }
-
-                tag @ <menu> => {
-                    self.close_p_element_in_button_scope();
-                    self.insert_element_for(tag);
-                    Done
-                }
-
-                tag @ <h1> <h2> <h3> <h4> <h5> <h6> => {
-                    self.close_p_element_in_button_scope();
-                    if self.current_node_in(heading_tag) {
-                        self.sink.parse_error(Borrowed("nested heading tags"));
-                        self.pop();
-                    }
-                    self.insert_element_for(tag);
-                    Done
-                }
-
-                tag @ <pre> <listing> => {
-                    self.close_p_element_in_button_scope();
-                    self.insert_element_for(tag);
-                    self.ignore_lf = true;
-                    self.frameset_ok = false;
-                    Done
-                }
-
-                tag @ <form> => {
-                    if self.form_elem.is_some() &&
-                       !self.in_html_elem_named(local_name!("template")) {
-                        self.sink.parse_error(Borrowed("nested forms"));
-                    } else {
-                        self.close_p_element_in_button_scope();
-                        let elem = self.insert_element_for(tag);
-                        if !self.in_html_elem_named(local_name!("template")) {
-                            self.form_elem = Some(elem);
-                        }
-                    }
-                    Done
-                }
-
-                tag @ <li> <dd> <dt> => {
-                    declare_tag_set!(close_list = "li");
-                    declare_tag_set!(close_defn = "dd" "dt");
-                    declare_tag_set!(extra_special = [special_tag] - "address" "div" "p");
-                    let list = match tag.name {
-                        local_name!("li") => true,
-                        local_name!("dd") | local_name!("dt") => false,
-                        _ => unreachable!(),
-                    };
-
-                    self.frameset_ok = false;
-
-                    let mut to_close = None;
-                    for node in self.open_elems.iter().rev() {
-                        let name = self.sink.elem_name(node);
-                        let can_close = if list {
-                            close_list(name)
-                        } else {
-                            close_defn(name)
-                        };
-                        if can_close {
-                            to_close = Some(name.local.clone());
-                            break;
-                        }
-                        if extra_special(name) {
-                            break;
-                        }
-                    }
-
-                    match to_close {
-                        Some(name) => {
-                            self.generate_implied_end_except(name.clone());
-                            self.expect_to_close(name);
-                        }
-                        None => (),
-                    }
-
-                    self.close_p_element_in_button_scope();
-                    self.insert_element_for(tag);
-                    Done
-                }
-
-                tag @ <plaintext> => {
-                    self.close_p_element_in_button_scope();
-                    self.insert_element_for(tag);
-                    ToPlaintext
-                }
-
-                tag @ <button> => {
-                    if self.in_scope_named(default_scope, local_name!("button")) {
-                        self.sink.parse_error(Borrowed("nested buttons"));
-                        self.generate_implied_end(cursory_implied_end);
-                        self.pop_until_named(local_name!("button"));
-                    }
-                    self.reconstruct_formatting();
-                    self.insert_element_for(tag);
-                    self.frameset_ok = false;
-                    Done
-                }
-
-                tag @ </address> </article> </aside> </blockquote> </button> </center>
-                  </details> </dialog> </dir> </div> </dl> </fieldset> </figcaption>
-                  </figure> </footer> </header> </hgroup> </listing> </main> </menu>
-                  </nav> </ol> </pre> </section> </summary> </ul> => {
-                    if !self.in_scope_named(default_scope, tag.name.clone()) {
-                        self.unexpected(&tag);
-                    } else {
-                        self.generate_implied_end(cursory_implied_end);
-                        self.expect_to_close(tag.name);
-                    }
-                    Done
-                }
-
-                </form> => {
-                    if !self.in_html_elem_named(local_name!("template")) {
-                        // Can't use unwrap_or_return!() due to rust-lang/rust#16617.
-                        let node = match self.form_elem.take() {
-                            None => {
-                                self.sink.parse_error(Borrowed("Null form element pointer on </form>"));
-                                return Done;
-                            }
-                            Some(x) => x,
-                        };
-                        if !self.in_scope(default_scope, |n| self.sink.same_node(&node, &n)) {
-                            self.sink.parse_error(Borrowed("Form element not in scope on </form>"));
-                            return Done;
-                        }
-                        self.generate_implied_end(cursory_implied_end);
-                        let current = self.current_node().clone();
-                        self.remove_from_stack(&node);
-                        if !self.sink.same_node(&current, &node) {
-                            self.sink.parse_error(Borrowed("Bad open element on </form>"));
-                        }
-                    } else {
-                        if !self.in_scope_named(default_scope, local_name!("form")) {
-                            self.sink.parse_error(Borrowed("Form element not in scope on </form>"));
-                            return Done;
-                        }
-                        self.generate_implied_end(cursory_implied_end);
-                        if !self.current_node_named(local_name!("form")) {
-                            self.sink.parse_error(Borrowed("Bad open element on </form>"));
-                        }
-                        self.pop_until_named(local_name!("form"));
-                    }
-                    Done
-                }
-
-                </p> => {
-                    if !self.in_scope_named(button_scope, local_name!("p")) {
-                        self.sink.parse_error(Borrowed("No <p> tag to close"));
-                        self.insert_phantom(local_name!("p"));
-                    }
-                    self.close_p_element();
-                    Done
-                }
-
-                tag @ </li> </dd> </dt> => {
-                    let in_scope = if tag.name == local_name!("li") {
-                        self.in_scope_named(list_item_scope, tag.name.clone())
-                    } else {
-                        self.in_scope_named(default_scope, tag.name.clone())
-                    };
-                    if in_scope {
-                        self.generate_implied_end_except(tag.name.clone());
-                        self.expect_to_close(tag.name);
-                    } else {
-                        self.sink.parse_error(Borrowed("No matching tag to close"));
-                    }
-                    Done
-                }
-
-                tag @ </h1> </h2> </h3> </h4> </h5> </h6> => {
-                    if self.in_scope(default_scope, |n| self.elem_in(&n, heading_tag)) {
-                        self.generate_implied_end(cursory_implied_end);
-                        if !self.current_node_named(tag.name) {
-                            self.sink.parse_error(Borrowed("Closing wrong heading tag"));
-                        }
-                        self.pop_until(heading_tag);
-                    } else {
-                        self.sink.parse_error(Borrowed("No heading tag to close"));
-                    }
-                    Done
-                }
-
-                tag @ <a> => {
-                    self.handle_misnested_a_tags(&tag);
-                    self.reconstruct_formatting();
-                    self.create_formatting_element_for(tag);
-                    Done
-                }
-
-                tag @ <b> <big> <code> <em> <font> <i> <s> <small> <strike> <strong> <tt> <u> => {
-                    self.reconstruct_formatting();
-                    self.create_formatting_element_for(tag);
-                    Done
-                }
-
-                tag @ <nobr> => {
-                    self.reconstruct_formatting();
-                    if self.in_scope_named(default_scope, local_name!("nobr")) {
-                        self.sink.parse_error(Borrowed("Nested <nobr>"));
-                        self.adoption_agency(local_name!("nobr"));
-                        self.reconstruct_formatting();
-                    }
-                    self.create_formatting_element_for(tag);
-                    Done
-                }
-
-                tag @ </a> </b> </big> </code> </em> </font> </i> </nobr>
-                  </s> </small> </strike> </strong> </tt> </u> => {
-                    self.adoption_agency(tag.name);
-                    Done
-                }
-
-                tag @ <applet> <marquee> <object> => {
-                    self.reconstruct_formatting();
-                    self.insert_element_for(tag);
-                    self.active_formatting.push(Marker);
-                    self.frameset_ok = false;
-                    Done
-                }
-
-                tag @ </applet> </marquee> </object> => {
-                    if !self.in_scope_named(default_scope, tag.name.clone()) {
-                        self.unexpected(&tag);
-                    } else {
-                        self.generate_implied_end(cursory_implied_end);
-                        self.expect_to_close(tag.name);
-                        self.clear_active_formatting_to_marker();
-                    }
-                    Done
-                }
-
-                tag @ <table> => {
-                    if self.quirks_mode != Quirks {
-                        self.close_p_element_in_button_scope();
-                    }
-                    self.insert_element_for(tag);
-                    self.frameset_ok = false;
-                    self.mode = InTable;
-                    Done
-                }
-
-                tag @ </br> => {
-                    self.unexpected(&tag);
-                    self.step(InBody, TagToken(Tag {
-                        kind: StartTag,
-                        attrs: vec!(),
-                        ..tag
-                    }))
-                }
-
-                tag @ <area> <br> <embed> <img> <keygen> <wbr> <input> => {
-                    let keep_frameset_ok = match tag.name {
-                        local_name!("input") => self.is_type_hidden(&tag),
-                        _ => false,
-                    };
-                    self.reconstruct_formatting();
-                    self.insert_and_pop_element_for(tag);
-                    if !keep_frameset_ok {
-                        self.frameset_ok = false;
-                    }
-                    DoneAckSelfClosing
-                }
-
-                tag @ <param> <source> <track> => {
-                    self.insert_and_pop_element_for(tag);
-                    DoneAckSelfClosing
-                }
-
-                tag @ <hr> => {
-                    self.close_p_element_in_button_scope();
-                    self.insert_and_pop_element_for(tag);
-                    self.frameset_ok = false;
-                    DoneAckSelfClosing
-                }
-
-                tag @ <image> => {
-                    self.unexpected(&tag);
-                    self.step(InBody, TagToken(Tag {
-                        name: local_name!("img"),
-                        ..tag
-                    }))
-                }
-
-                tag @ <textarea> => {
-                    self.ignore_lf = true;
-                    self.frameset_ok = false;
-                    self.parse_raw_data(tag, Rcdata)
-                }
-
-                tag @ <xmp> => {
-                    self.close_p_element_in_button_scope();
-                    self.reconstruct_formatting();
-                    self.frameset_ok = false;
-                    self.parse_raw_data(tag, Rawtext)
-                }
-
-                tag @ <iframe> => {
-                    self.frameset_ok = false;
-                    self.parse_raw_data(tag, Rawtext)
-                }
-
-                tag @ <noembed> => {
-                    self.parse_raw_data(tag, Rawtext)
-                }
-
-                // <noscript> handled in wildcard case below
-
-                tag @ <select> => {
-                    self.reconstruct_formatting();
-                    self.insert_element_for(tag);
-                    self.frameset_ok = false;
-                    // NB: mode == InBody but possibly self.mode != mode, if
-                    // we're processing "as in the rules for InBody".
-                    self.mode = match self.mode {
-                        InTable | InCaption | InTableBody
-                            | InRow | InCell => InSelectInTable,
-                        _ => InSelect,
-                    };
-                    Done
-                }
-
-                tag @ <optgroup> <option> => {
-                    if self.current_node_named(local_name!("option")) {
-                        self.pop();
-                    }
-                    self.reconstruct_formatting();
-                    self.insert_element_for(tag);
-                    Done
-                }
-
-                tag @ <rb> <rtc> => {
-                    if self.in_scope_named(default_scope, local_name!("ruby")) {
-                        self.generate_implied_end(cursory_implied_end);
-                    }
-                    if !self.current_node_named(local_name!("ruby")) {
-                        self.unexpected(&tag);
-                    }
-                    self.insert_element_for(tag);
-                    Done
-                }
-
-                tag @ <rp> <rt> => {
-                    if self.in_scope_named(default_scope, local_name!("ruby")) {
-                        self.generate_implied_end_except(local_name!("rtc"));
-                    }
-                    if !self.current_node_named(local_name!("rtc")) && !self.current_node_named(local_name!("ruby")) {
-                        self.unexpected(&tag);
-                    }
-                    self.insert_element_for(tag);
-                    Done
-                }
-
-                tag @ <math> => self.enter_foreign(tag, ns!(mathml)),
-
-                tag @ <svg> => self.enter_foreign(tag, ns!(svg)),
-
-                <caption> <col> <colgroup> <frame> <head>
-                  <tbody> <td> <tfoot> <th> <thead> <tr> => {
-                    self.unexpected(&token);
-                    Done
-                }
-
-                tag @ <_> => {
-                    if self.opts.scripting_enabled && tag.name == local_name!("noscript") {
-                        self.parse_raw_data(tag, Rawtext)
-                    } else {
-                        self.reconstruct_formatting();
-                        self.insert_element_for(tag);
-                        Done
-                    }
-                }
-
-                tag @ </_> => {
-                    self.process_end_tag_in_body(tag);
-                    Done
-                }
-
-                // FIXME: This should be unreachable, but match_token requires a
-                // catch-all case.
-                _ => panic!("impossible case in InBody mode"),
-            }),
-
-            //§ parsing-main-incdata
-            Text => match_token!(token {
-                CharacterTokens(_, text) => self.append_text(text),
-
-                EOFToken => {
-                    self.unexpected(&token);
-                    if self.current_node_named(local_name!("script")) {
-                        let current = current_node(&self.open_elems);
-                        self.sink.mark_script_already_started(current);
-                    }
-                    self.pop();
-                    Reprocess(self.orig_mode.take().unwrap(), token)
-                }
-
-                tag @ </_> => {
-                    let node = self.pop();
-                    self.mode = self.orig_mode.take().unwrap();
-                    if tag.name == local_name!("script") {
-                        return Script(node);
-                    }
-                    Done
-                }
-
-                // The spec doesn't say what to do here.
-                // Other tokens are impossible?
-                _ => panic!("impossible case in Text mode"),
-            }),
-
-            //§ parsing-main-intable
-            InTable => match_token!(token {
-                // FIXME: hack, should implement pat | pat for match_token instead
-                NullCharacterToken => self.process_chars_in_table(token),
-
-                CharacterTokens(..) => self.process_chars_in_table(token),
-
-                CommentToken(text) => self.append_comment(text),
-
-                tag @ <caption> => {
-                    self.pop_until_current(table_scope);
-                    self.active_formatting.push(Marker);
-                    self.insert_element_for(tag);
-                    self.mode = InCaption;
-                    Done
-                }
-
-                tag @ <colgroup> => {
-                    self.pop_until_current(table_scope);
-                    self.insert_element_for(tag);
-                    self.mode = InColumnGroup;
-                    Done
-                }
-
-                <col> => {
-                    self.pop_until_current(table_scope);
-                    self.insert_phantom(local_name!("colgroup"));
-                    Reprocess(InColumnGroup, token)
-                }
-
-                tag @ <tbody> <tfoot> <thead> => {
-                    self.pop_until_current(table_scope);
-                    self.insert_element_for(tag);
-                    self.mode = InTableBody;
-                    Done
-                }
-
-                <td> <th> <tr> => {
-                    self.pop_until_current(table_scope);
-                    self.insert_phantom(local_name!("tbody"));
-                    Reprocess(InTableBody, token)
-                }
-
-                <table> => {
-                    self.unexpected(&token);
-                    if self.in_scope_named(table_scope, local_name!("table")) {
-                        self.pop_until_named(local_name!("table"));
-                        Reprocess(self.reset_insertion_mode(), token)
-                    } else {
-                        Done
-                    }
-                }
-
-                </table> => {
-                    if self.in_scope_named(table_scope, local_name!("table")) {
-                        self.pop_until_named(local_name!("table"));
-                        self.mode = self.reset_insertion_mode();
-                    } else {
-                        self.unexpected(&token);
-                    }
-                    Done
-                }
-
-                </body> </caption> </col> </colgroup> </html>
-                  </tbody> </td> </tfoot> </th> </thead> </tr> =>
-                    self.unexpected(&token),
-
-                <style> <script> <template> </template>
-                    => self.step(InHead, token),
-
-                tag @ <input> => {
-                    self.unexpected(&tag);
-                    if self.is_type_hidden(&tag) {
-                        self.insert_and_pop_element_for(tag);
-                        DoneAckSelfClosing
-                    } else {
-                        self.foster_parent_in_body(TagToken(tag))
-                    }
-                }
-
-                tag @ <form> => {
-                    self.unexpected(&tag);
-                    if !self.in_html_elem_named(local_name!("template")) && self.form_elem.is_none() {
-                        self.form_elem = Some(self.insert_and_pop_element_for(tag));
-                    }
-                    Done
-                }
-
-                EOFToken => self.step(InBody, token),
-
-                token => {
-                    self.unexpected(&token);
-                    self.foster_parent_in_body(token)
-                }
-            }),
-
-            //§ parsing-main-intabletext
-            InTableText => match_token!(token {
-                NullCharacterToken => self.unexpected(&token),
-
-                CharacterTokens(split, text) => {
-                    self.pending_table_text.push((split, text));
-                    Done
-                }
-
-                token => {
-                    let pending = replace(&mut self.pending_table_text, vec!());
-                    let contains_nonspace = pending.iter().any(|&(split, ref text)| {
-                        match split {
-                            Whitespace => false,
-                            NotWhitespace => true,
-                            NotSplit => any_not_whitespace(text),
-                        }
-                    });
-
-                    if contains_nonspace {
-                        self.sink.parse_error(Borrowed("Non-space table text"));
-                        for (split, text) in pending.into_iter() {
-                            match self.foster_parent_in_body(CharacterTokens(split, text)) {
-                                Done => (),
-                                _ => panic!("not prepared to handle this!"),
-                            }
-                        }
-                    } else {
-                        for (_, text) in pending.into_iter() {
-                            self.append_text(text);
-                        }
-                    }
-
-                    Reprocess(self.orig_mode.take().unwrap(), token)
-                }
-            }),
-
-            //§ parsing-main-incaption
-            InCaption => match_token!(token {
-                tag @ <caption> <col> <colgroup> <tbody> <td> <tfoot>
-                  <th> <thead> <tr> </table> </caption> => {
-                    if self.in_scope_named(table_scope, local_name!("caption")) {
-                        self.generate_implied_end(cursory_implied_end);
-                        self.expect_to_close(local_name!("caption"));
-                        self.clear_active_formatting_to_marker();
-                        match tag {
-                            Tag { kind: EndTag, name: local_name!("caption"), .. } => {
-                                self.mode = InTable;
-                                Done
-                            }
-                            _ => Reprocess(InTable, TagToken(tag))
-                        }
-                    } else {
-                        self.unexpected(&tag);
-                        Done
-                    }
-                }
-
-                </body> </col> </colgroup> </html> </tbody>
-                  </td> </tfoot> </th> </thead> </tr> => self.unexpected(&token),
-
-                token => self.step(InBody, token),
-            }),
-
-            //§ parsing-main-incolgroup
-            InColumnGroup => match_token!(token {
-                CharacterTokens(NotSplit, text) => SplitWhitespace(text),
-                CharacterTokens(Whitespace, text) => self.append_text(text),
-                CommentToken(text) => self.append_comment(text),
-
-                <html> => self.step(InBody, token),
-
-                tag @ <col> => {
-                    self.insert_and_pop_element_for(tag);
-                    DoneAckSelfClosing
-                }
-
-                </colgroup> => {
-                    if self.current_node_named(local_name!("colgroup")) {
-                        self.pop();
-                        self.mode = InTable;
-                    } else {
-                        self.unexpected(&token);
-                    }
-                    Done
-                }
-
-                </col> => self.unexpected(&token),
-
-                <template> </template> => self.step(InHead, token),
-
-                EOFToken => self.step(InBody, token),
-
-                token => {
-                    if self.current_node_named(local_name!("colgroup")) {
-                        self.pop();
-                        Reprocess(InTable, token)
-                    } else {
-                        self.unexpected(&token)
-                    }
-                }
-            }),
-
-            //§ parsing-main-intbody
-            InTableBody => match_token!(token {
-                tag @ <tr> => {
-                    self.pop_until_current(table_body_context);
-                    self.insert_element_for(tag);
-                    self.mode = InRow;
-                    Done
-                }
-
-                <th> <td> => {
-                    self.unexpected(&token);
-                    self.pop_until_current(table_body_context);
-                    self.insert_phantom(local_name!("tr"));
-                    Reprocess(InRow, token)
-                }
-
-                tag @ </tbody> </tfoot> </thead> => {
-                    if self.in_scope_named(table_scope, tag.name.clone()) {
-                        self.pop_until_current(table_body_context);
-                        self.pop();
-                        self.mode = InTable;
-                    } else {
-                        self.unexpected(&tag);
-                    }
-                    Done
-                }
-
-                <caption> <col> <colgroup> <tbody> <tfoot> <thead> </table> => {
-                    declare_tag_set!(table_outer = "table" "tbody" "tfoot");
-                    if self.in_scope(table_scope, |e| self.elem_in(&e, table_outer)) {
-                        self.pop_until_current(table_body_context);
-                        self.pop();
-                        Reprocess(InTable, token)
-                    } else {
-                        self.unexpected(&token)
-                    }
-                }
-
-                </body> </caption> </col> </colgroup> </html> </td> </th> </tr>
-                    => self.unexpected(&token),
-
-                token => self.step(InTable, token),
-            }),
-
-            //§ parsing-main-intr
-            InRow => match_token!(token {
-                tag @ <th> <td> => {
-                    self.pop_until_current(table_row_context);
-                    self.insert_element_for(tag);
-                    self.mode = InCell;
-                    self.active_formatting.push(Marker);
-                    Done
-                }
-
-                </tr> => {
-                    if self.in_scope_named(table_scope, local_name!("tr")) {
-                        self.pop_until_current(table_row_context);
-                        let node = self.pop();
-                        self.assert_named(&node, local_name!("tr"));
-                        self.mode = InTableBody;
-                    } else {
-                        self.unexpected(&token);
-                    }
-                    Done
-                }
-
-                <caption> <col> <colgroup> <tbody> <tfoot> <thead> <tr> </table> => {
-                    if self.in_scope_named(table_scope, local_name!("tr")) {
-                        self.pop_until_current(table_row_context);
-                        let node = self.pop();
-                        self.assert_named(&node, local_name!("tr"));
-                        Reprocess(InTableBody, token)
-                    } else {
-                        self.unexpected(&token)
-                    }
-                }
-
-                tag @ </tbody> </tfoot> </thead> => {
-                    if self.in_scope_named(table_scope, tag.name.clone()) {
-                        if self.in_scope_named(table_scope, local_name!("tr")) {
-                            self.pop_until_current(table_row_context);
-                            let node = self.pop();
-                            self.assert_named(&node, local_name!("tr"));
-                            Reprocess(InTableBody, TagToken(tag))
-                        } else {
-                            Done
-                        }
-                    } else {
-                        self.unexpected(&tag)
-                    }
-                }
-
-                </body> </caption> </col> </colgroup> </html> </td> </th>
-                    => self.unexpected(&token),
-
-                token => self.step(InTable, token),
-            }),
-
-            //§ parsing-main-intd
-            InCell => match_token!(token {
-                tag @ </td> </th> => {
-                    if self.in_scope_named(table_scope, tag.name.clone()) {
-                        self.generate_implied_end(cursory_implied_end);
-                        self.expect_to_close(tag.name);
-                        self.clear_active_formatting_to_marker();
-                        self.mode = InRow;
-                    } else {
-                        self.unexpected(&tag);
-                    }
-                    Done
-                }
-
-                <caption> <col> <colgroup> <tbody> <td> <tfoot> <th> <thead> <tr> => {
-                    if self.in_scope(table_scope, |n| self.elem_in(&n, td_th)) {
-                        self.close_the_cell();
-                        Reprocess(InRow, token)
-                    } else {
-                        self.unexpected(&token)
-                    }
-                }
-
-                </body> </caption> </col> </colgroup> </html>
-                    => self.unexpected(&token),
-
-                tag @ </table> </tbody> </tfoot> </thead> </tr> => {
-                    if self.in_scope_named(table_scope, tag.name.clone()) {
-                        self.close_the_cell();
-                        Reprocess(InRow, TagToken(tag))
-                    } else {
-                        self.unexpected(&tag)
-                    }
-                }
-
-                token => self.step(InBody, token),
-            }),
-
-            //§ parsing-main-inselect
-            InSelect => match_token!(token {
-                NullCharacterToken => self.unexpected(&token),
-                CharacterTokens(_, text) => self.append_text(text),
-                CommentToken(text) => self.append_comment(text),
-
-                <html> => self.step(InBody, token),
-
-                tag @ <option> => {
-                    if self.current_node_named(local_name!("option")) {
-                        self.pop();
-                    }
-                    self.insert_element_for(tag);
-                    Done
-                }
-
-                tag @ <optgroup> => {
-                    if self.current_node_named(local_name!("option")) {
-                        self.pop();
-                    }
-                    if self.current_node_named(local_name!("optgroup")) {
-                        self.pop();
-                    }
-                    self.insert_element_for(tag);
-                    Done
-                }
-
-                </optgroup> => {
-                    if self.open_elems.len() >= 2
-                        && self.current_node_named(local_name!("option"))
-                        && self.html_elem_named(&self.open_elems[self.open_elems.len() - 2],
-                            local_name!("optgroup")) {
-                        self.pop();
-                    }
-                    if self.current_node_named(local_name!("optgroup")) {
-                        self.pop();
-                    } else {
-                        self.unexpected(&token);
-                    }
-                    Done
-                }
-
-                </option> => {
-                    if self.current_node_named(local_name!("option")) {
-                        self.pop();
-                    } else {
-                        self.unexpected(&token);
-                    }
-                    Done
-                }
-
-                tag @ <select> </select> => {
-                    let in_scope = self.in_scope_named(select_scope, local_name!("select"));
-
-                    if !in_scope || tag.kind == StartTag {
-                        self.unexpected(&tag);
-                    }
-
-                    if in_scope {
-                        self.pop_until_named(local_name!("select"));
-                        self.mode = self.reset_insertion_mode();
-                    }
-                    Done
-                }
-
-                <input> <keygen> <textarea> => {
-                    self.unexpected(&token);
-                    if self.in_scope_named(select_scope, local_name!("select")) {
-                        self.pop_until_named(local_name!("select"));
-                        Reprocess(self.reset_insertion_mode(), token)
-                    } else {
-                        Done
-                    }
-                }
-
-                <script> <template> </template> => self.step(InHead, token),
-
-                EOFToken => self.step(InBody, token),
-
-                token => self.unexpected(&token),
-            }),
-
-            //§ parsing-main-inselectintable
-            InSelectInTable => match_token!(token {
-                <caption> <table> <tbody> <tfoot> <thead> <tr> <td> <th> => {
-                    self.unexpected(&token);
-                    self.pop_until_named(local_name!("select"));
-                    Reprocess(self.reset_insertion_mode(), token)
-                }
-
-                tag @ </caption> </table> </tbody> </tfoot> </thead> </tr> </td> </th> => {
-                    self.unexpected(&tag);
-                    if self.in_scope_named(table_scope, tag.name.clone()) {
-                        self.pop_until_named(local_name!("select"));
-                        Reprocess(self.reset_insertion_mode(), TagToken(tag))
-                    } else {
-                        Done
-                    }
-                }
-
-                token => self.step(InSelect, token),
-            }),
-
-            //§ parsing-main-intemplate
-            InTemplate => match_token!(token {
-                CharacterTokens(_, _) => self.step(InBody, token),
-                CommentToken(_) => self.step(InBody, token),
-
-                <base> <basefont> <bgsound> <link> <meta> <noframes> <script>
-                <style> <template> <title> </template> => {
-                    self.step(InHead, token)
-                }
-
-                <caption> <colgroup> <tbody> <tfoot> <thead> => {
-                    self.template_modes.pop();
-                    self.template_modes.push(InTable);
-                    Reprocess(InTable, token)
-                }
-
-                <col> => {
-                    self.template_modes.pop();
-                    self.template_modes.push(InColumnGroup);
-                    Reprocess(InColumnGroup, token)
-                }
-
-                <tr> => {
-                    self.template_modes.pop();
-                    self.template_modes.push(InTableBody);
-                    Reprocess(InTableBody, token)
-                }
-
-                <td> <th> => {
-                    self.template_modes.pop();
-                    self.template_modes.push(InRow);
-                    Reprocess(InRow, token)
-                }
-
-                EOFToken => {
-                    if !self.in_html_elem_named(local_name!("template")) {
-                        self.stop_parsing()
-                    } else {
-                        self.unexpected(&token);
-                        self.pop_until_named(local_name!("template"));
-                        self.clear_active_formatting_to_marker();
-                        self.template_modes.pop();
-                        self.mode = self.reset_insertion_mode();
-                        Reprocess(self.reset_insertion_mode(), token)
-                    }
-                }
-
-                tag @ <_> => {
-                    self.template_modes.pop();
-                    self.template_modes.push(InBody);
-                    Reprocess(InBody, TagToken(tag))
-                }
-
-                token => self.unexpected(&token),
-            }),
-
-            //§ parsing-main-afterbody
-            AfterBody => match_token!(token {
-                CharacterTokens(NotSplit, text) => SplitWhitespace(text),
-                CharacterTokens(Whitespace, _) => self.step(InBody, token),
-                CommentToken(text) => self.append_comment_to_html(text),
-
-                <html> => self.step(InBody, token),
-
-                </html> => {
-                    if self.is_fragment() {
-                        self.unexpected(&token);
-                    } else {
-                        self.mode = AfterAfterBody;
-                    }
-                    Done
-                }
-
-                EOFToken => self.stop_parsing(),
-
-                token => {
-                    self.unexpected(&token);
-                    Reprocess(InBody, token)
-                }
-            }),
-
-            //§ parsing-main-inframeset
-            InFrameset => match_token!(token {
-                CharacterTokens(NotSplit, text) => SplitWhitespace(text),
-                CharacterTokens(Whitespace, text) => self.append_text(text),
-                CommentToken(text) => self.append_comment(text),
-
-                <html> => self.step(InBody, token),
-
-                tag @ <frameset> => {
-                    self.insert_element_for(tag);
-                    Done
-                }
-
-                </frameset> => {
-                    if self.open_elems.len() == 1 {
-                        self.unexpected(&token);
-                    } else {
-                        self.pop();
-                        if !self.is_fragment() && !self.current_node_named(local_name!("frameset")) {
-                            self.mode = AfterFrameset;
-                        }
-                    }
-                    Done
-                }
-
-                tag @ <frame> => {
-                    self.insert_and_pop_element_for(tag);
-                    DoneAckSelfClosing
-                }
-
-                <noframes> => self.step(InHead, token),
-
-                EOFToken => {
-                    if self.open_elems.len() != 1 {
-                        self.unexpected(&token);
-                    }
-                    self.stop_parsing()
-                }
-
-                token => self.unexpected(&token),
-            }),
-
-            //§ parsing-main-afterframeset
-            AfterFrameset => match_token!(token {
-                CharacterTokens(NotSplit, text) => SplitWhitespace(text),
-                CharacterTokens(Whitespace, text) => self.append_text(text),
-                CommentToken(text) => self.append_comment(text),
-
-                <html> => self.step(InBody, token),
-
-                </html> => {
-                    self.mode = AfterAfterFrameset;
-                    Done
-                }
-
-                <noframes> => self.step(InHead, token),
-
-                EOFToken => self.stop_parsing(),
-
-                token => self.unexpected(&token),
-            }),
-
-            //§ the-after-after-body-insertion-mode
-            AfterAfterBody => match_token!(token {
-                CharacterTokens(NotSplit, text) => SplitWhitespace(text),
-                CharacterTokens(Whitespace, _) => self.step(InBody, token),
-                CommentToken(text) => self.append_comment_to_doc(text),
-
-                <html> => self.step(InBody, token),
-
-                EOFToken => self.stop_parsing(),
-
-                token => {
-                    self.unexpected(&token);
-                    Reprocess(InBody, token)
-                }
-            }),
-
-            //§ the-after-after-frameset-insertion-mode
-            AfterAfterFrameset => match_token!(token {
-                CharacterTokens(NotSplit, text) => SplitWhitespace(text),
-                CharacterTokens(Whitespace, _) => self.step(InBody, token),
-                CommentToken(text) => self.append_comment_to_doc(text),
-
-                <html> => self.step(InBody, token),
-
-                EOFToken => self.stop_parsing(),
-
-                <noframes> => self.step(InHead, token),
-
-                token => self.unexpected(&token),
-            }),
-            //§ END
-        }
-    }
-
-    fn step_foreign(&mut self, token: Token) -> ProcessResult<Handle> {
-        match_token!(token {
-            NullCharacterToken => {
-                self.unexpected(&token);
-                self.append_text("\u{fffd}".to_tendril())
-            }
-
-            CharacterTokens(_, text) => {
-                if any_not_whitespace(&text) {
-                    self.frameset_ok = false;
-                }
-                self.append_text(text)
-            }
-
-            CommentToken(text) => self.append_comment(text),
-
-            tag @ <b> <big> <blockquote> <body> <br> <center> <code> <dd> <div> <dl>
-                <dt> <em> <embed> <h1> <h2> <h3> <h4> <h5> <h6> <head> <hr> <i>
-                <img> <li> <listing> <menu> <meta> <nobr> <ol> <p> <pre> <ruby>
-                <s> <small> <span> <strong> <strike> <sub> <sup> <table> <tt>
-                <u> <ul> <var> => self.unexpected_start_tag_in_foreign_content(tag),
-
-            tag @ <font> => {
-                let unexpected = tag.attrs.iter().any(|attr| {
-                    matches!(attr.name.expanded(),
-                             expanded_name!("", "color") |
-                             expanded_name!("", "face") |
-                             expanded_name!("", "size"))
-                });
-                if unexpected {
-                    self.unexpected_start_tag_in_foreign_content(tag)
-                } else {
-                    self.foreign_start_tag(tag)
-                }
-            }
-
-            tag @ <_> => self.foreign_start_tag(tag),
-
-            // FIXME(#118): </script> in SVG
-
-            tag @ </_> => {
-                let mut first = true;
-                let mut stack_idx = self.open_elems.len() - 1;
-                loop {
-                    if stack_idx == 0 {
-                        return Done;
-                    }
-
-                    let html;
-                    let eq;
-                    {
-                        let node_name = self.sink.elem_name(&self.open_elems[stack_idx]);
-                        html = *node_name.ns == ns!(html);
-                        eq = node_name.local.eq_ignore_ascii_case(&tag.name);
-                    }
-                    if !first && html {
-                        let mode = self.mode;
-                        return self.step(mode, TagToken(tag));
-                    }
-
-                    if eq {
-                        self.open_elems.truncate(stack_idx);
-                        return Done;
-                    }
-
-                    if first {
-                        self.unexpected(&tag);
-                        first = false;
-                    }
-                    stack_idx -= 1;
-                }
-            }
-
-            // FIXME: This should be unreachable, but match_token requires a
-            // catch-all case.
-            _ => panic!("impossible case in foreign content"),
-        })
-    }
-}
diff --git a/src/tree_builder/tag_sets.rs b/src/tree_builder/tag_sets.rs
deleted file mode 100644
index 377b34c..0000000
--- a/src/tree_builder/tag_sets.rs
+++ /dev/null
@@ -1,115 +0,0 @@
-// Copyright 2014-2017 The html5ever Project Developers. See the
-// COPYRIGHT file at the top-level directory of this distribution.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! Various sets of HTML tag names, and macros for declaring them.
-
-use crate::ExpandedName;
-use mac::{_tt_as_expr_hack, matches};
-use markup5ever::{expanded_name, local_name, namespace_prefix, namespace_url, ns};
-
-macro_rules! declare_tag_set_impl ( ($param:ident, $b:ident, $supr:ident, $($tag:tt)+) => (
-    match $param {
-        $( expanded_name!(html $tag) => $b, )+
-        p => $supr(p),
-    }
-));
-
-macro_rules! declare_tag_set_body (
-    ($param:ident = [$supr:ident] - $($tag:tt)+)
-        => ( declare_tag_set_impl!($param, false, $supr, $($tag)+) );
-
-    ($param:ident = [$supr:ident] + $($tag:tt)+)
-        => ( declare_tag_set_impl!($param, true, $supr, $($tag)+) );
-
-    ($param:ident = $($tag:tt)+)
-        => ( declare_tag_set_impl!($param, true, empty_set, $($tag)+) );
-);
-
-macro_rules! declare_tag_set (
-    (pub $name:ident = $($toks:tt)+) => (
-        pub fn $name(p: crate::ExpandedName) -> bool {
-            declare_tag_set_body!(p = $($toks)+)
-        }
-    );
-
-    ($name:ident = $($toks:tt)+) => (
-        fn $name(p: crate::ExpandedName) -> bool {
-            declare_tag_set_body!(p = $($toks)+)
-        }
-    );
-);
-
-#[inline(always)]
-pub fn empty_set(_: ExpandedName) -> bool {
-    false
-}
-#[inline(always)]
-pub fn full_set(_: ExpandedName) -> bool {
-    true
-}
-
-declare_tag_set!(pub html_default_scope =
-    "applet" "caption" "html" "table" "td" "th" "marquee" "object" "template");
-
-#[inline(always)]
-pub fn default_scope(name: ExpandedName) -> bool {
-    html_default_scope(name) ||
-        mathml_text_integration_point(name) ||
-        svg_html_integration_point(name)
-}
-
-declare_tag_set!(pub list_item_scope = [default_scope] + "ol" "ul");
-declare_tag_set!(pub button_scope = [default_scope] + "button");
-declare_tag_set!(pub table_scope = "html" "table" "template");
-declare_tag_set!(pub select_scope = [full_set] - "optgroup" "option");
-
-declare_tag_set!(pub table_body_context = "tbody" "tfoot" "thead" "template" "html");
-declare_tag_set!(pub table_row_context = "tr" "template" "html");
-declare_tag_set!(pub td_th = "td" "th");
-
-declare_tag_set!(pub cursory_implied_end =
-    "dd" "dt" "li" "option" "optgroup" "p" "rb" "rp" "rt" "rtc");
-
-declare_tag_set!(pub thorough_implied_end = [cursory_implied_end]
-    + "caption" "colgroup" "tbody" "td" "tfoot" "th" "thead" "tr");
-
-declare_tag_set!(pub heading_tag = "h1" "h2" "h3" "h4" "h5" "h6");
-
-declare_tag_set!(pub special_tag =
-    "address" "applet" "area" "article" "aside" "base" "basefont" "bgsound" "blockquote" "body"
-    "br" "button" "caption" "center" "col" "colgroup" "dd" "details" "dir" "div" "dl" "dt" "embed"
-    "fieldset" "figcaption" "figure" "footer" "form" "frame" "frameset" "h1" "h2" "h3" "h4" "h5"
-    "h6" "head" "header" "hgroup" "hr" "html" "iframe" "img" "input" "isindex" "li" "link"
-    "listing" "main" "marquee" "menu" "meta" "nav" "noembed" "noframes" "noscript"
-    "object" "ol" "p" "param" "plaintext" "pre" "script" "section" "select" "source" "style"
-    "summary" "table" "tbody" "td" "template" "textarea" "tfoot" "th" "thead" "title" "tr" "track"
-    "ul" "wbr" "xmp");
-//§ END
-
-pub fn mathml_text_integration_point(p: ExpandedName) -> bool {
-    matches!(
-        p,
-        expanded_name!(mathml "mi") |
-            expanded_name!(mathml "mo") |
-            expanded_name!(mathml "mn") |
-            expanded_name!(mathml "ms") |
-            expanded_name!(mathml "mtext")
-    )
-}
-
-/// https://html.spec.whatwg.org/multipage/#html-integration-point
-pub fn svg_html_integration_point(p: ExpandedName) -> bool {
-    // annotation-xml are handle in another place
-    matches!(
-        p,
-        expanded_name!(svg "foreignObject") |
-            expanded_name!(svg "desc") |
-            expanded_name!(svg "title")
-    )
-}
diff --git a/src/tree_builder/types.rs b/src/tree_builder/types.rs
deleted file mode 100644
index e47d69b..0000000
--- a/src/tree_builder/types.rs
+++ /dev/null
@@ -1,95 +0,0 @@
-// Copyright 2014-2017 The html5ever Project Developers. See the
-// COPYRIGHT file at the top-level directory of this distribution.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-//! Types used within the tree builder code.  Not exported to users.
-
-use crate::tokenizer::states::RawKind;
-use crate::tokenizer::Tag;
-
-use crate::tendril::StrTendril;
-
-pub use self::FormatEntry::*;
-pub use self::InsertionMode::*;
-pub use self::InsertionPoint::*;
-pub use self::ProcessResult::*;
-pub use self::SplitStatus::*;
-pub use self::Token::*;
-
-#[derive(PartialEq, Eq, Copy, Clone, Debug)]
-pub enum InsertionMode {
-    Initial,
-    BeforeHtml,
-    BeforeHead,
-    InHead,
-    InHeadNoscript,
-    AfterHead,
-    InBody,
-    Text,
-    InTable,
-    InTableText,
-    InCaption,
-    InColumnGroup,
-    InTableBody,
-    InRow,
-    InCell,
-    InSelect,
-    InSelectInTable,
-    InTemplate,
-    AfterBody,
-    InFrameset,
-    AfterFrameset,
-    AfterAfterBody,
-    AfterAfterFrameset,
-}
-
-#[derive(PartialEq, Eq, Copy, Clone, Debug)]
-pub enum SplitStatus {
-    NotSplit,
-    Whitespace,
-    NotWhitespace,
-}
-
-/// A subset/refinement of `tokenizer::Token`.  Everything else is handled
-/// specially at the beginning of `process_token`.
-#[derive(PartialEq, Eq, Clone, Debug)]
-pub enum Token {
-    TagToken(Tag),
-    CommentToken(StrTendril),
-    CharacterTokens(SplitStatus, StrTendril),
-    NullCharacterToken,
-    EOFToken,
-}
-
-pub enum ProcessResult<Handle> {
-    Done,
-    DoneAckSelfClosing,
-    SplitWhitespace(StrTendril),
-    Reprocess(InsertionMode, Token),
-    ReprocessForeign(Token),
-    Script(Handle),
-    ToPlaintext,
-    ToRawData(RawKind),
-}
-
-pub enum FormatEntry<Handle> {
-    Element(Handle, Tag),
-    Marker,
-}
-
-pub enum InsertionPoint<Handle> {
-    /// Insert as last child in this parent.
-    LastChild(Handle),
-    /// Insert before this following sibling.
-    BeforeSibling(Handle),
-    /// Insertion point is decided based on existence of element's parent node.
-    TableFosterParenting {
-        element: Handle,
-        prev_element: Handle,
-    },
-}
diff --git a/src/util/str.rs b/src/util/str.rs
index b2eb41a..c0f89f0 100644
--- a/src/util/str.rs
+++ b/src/util/str.rs
@@ -8,13 +8,6 @@
 // except according to those terms.
 
 use mac::{_tt_as_expr_hack, matches};
-use std::fmt;
-
-pub fn to_escaped_string<T: fmt::Debug>(x: &T) -> String {
-    // FIXME: don't allocate twice
-    let string = format!("{:?}", x);
-    string.chars().flat_map(|c| c.escape_default()).collect()
-}
 
 /// If `c` is an ASCII letter, return the corresponding lowercase
 /// letter, otherwise None.
@@ -31,12 +24,6 @@ pub fn is_ascii_alnum(c: char) -> bool {
     matches!(c, '0'..='9' | 'a'..='z' | 'A'..='Z')
 }
 
-/// ASCII whitespace characters, as defined by
-/// tree construction modes that treat them specially.
-pub fn is_ascii_whitespace(c: char) -> bool {
-    matches!(c, '\t' | '\r' | '\n' | '\x0C' | ' ')
-}
-
 #[cfg(test)]
 #[allow(non_snake_case)]
 mod test {