1 files changed, 24 insertions, 0 deletions
diff --git a/src/attr.rs b/src/attr.rs
index 4c7e330..d062a84 100644
--- a/src/attr.rs
+++ b/src/attr.rs
@@ -34,6 +34,18 @@ pub(crate) struct AttrInternal<O> {
     pub name_offset: O,
     /// The start offset of the attribute value.
     pub value_offset: O,
+    pub value_syntax: Option<AttrValueSyntax>,
+}
+
+/// The syntax of the attribute value.
+#[derive(Clone, Copy, PartialEq, Eq, Debug)]
+pub enum AttrValueSyntax {
+    /// An unquoted attribute value, e.g. `id=foo`.
+    Unquoted,
+    /// A single-quoted attribute value, e.g. `id='foo'`.
+    SingleQuoted,
+    /// A double-quoted attribute value, e.g. `id="foo"`.
+    DoubleQuoted,
 }
 
 /// An HTML attribute borrowed from an [`AttributeMap`].
@@ -54,6 +66,9 @@ pub struct AttributeOwned<O> {
     pub name_offset: O,
     /// The start offset of the attribute value.
     pub value_offset: O, // TODO: wrap this in an Option once we can recognize the empty attribute syntax
+    /// The syntax of the attribute value.
+    /// `None` indicates the empty attribute syntax (e.g. `disabled` in `<input disabled>`).
+    pub value_syntax: Option<AttrValueSyntax>,
 }
 
 impl<O> AttributeMap<O> {
@@ -85,6 +100,13 @@ impl<'a, O: Offset> Attribute<'a, O> {
     pub fn value_span(&self) -> Range<O> {
         self.map_val.value_offset..self.map_val.value_offset + self.map_val.value.len()
     }
+
+    /// Returns the attribute value syntax in case the value is explicitly defined.
+    ///
+    /// Returns `None` for attributes using the empty attribute syntax (e.g. `disabled` in `<input disabled>`).
+    pub fn value_syntax(&self) -> Option<AttrValueSyntax> {
+        self.map_val.value_syntax
+    }
 }
 
 // We cannot impl Index<Output=Attribute> because Index::index returns a reference of
@@ -120,6 +142,7 @@ impl<O> Iterator for AttrIntoIter<O> {
             value: map_val.value,
             name_offset: map_val.name_offset,
             value_offset: map_val.value_offset,
+            value_syntax: map_val.value_syntax,
         })
     }
 }
@@ -158,6 +181,7 @@ impl<O: Default> FromIterator<(String, String)> for AttributeMap<O> {
                             value,
                             name_offset: O::default(),
                             value_offset: O::default(),
+                            value_syntax: Some(AttrValueSyntax::DoubleQuoted),
                         },
                     )
                 })