chore: move Attribute to attr module

This is done separately so that the following commit has a cleaner diff.

1 files changed, 14 insertions, 0 deletions

diff --git a/src/attr.rs b/src/attr.rs
new file mode 100644
index 0000000..d0d506e
--- /dev/null
+++ b/src/attr.rs
@@ -0,0 +1,14 @@
+use std::ops::Range;
+
+/// A HTML attribute value (plus spans).
+#[derive(Debug, Eq, PartialEq)]
+pub struct Attribute<O> {
+    /// The value of the attribute.
+    pub value: String,
+
+    /// The source code span of the attribute name.
+    pub name_span: Range<O>,
+
+    /// The source code span of the attribute value.
+    pub value_span: Range<O>,
+}