fix(html/parser): fence in html files (#9537)

Author: ematipico

.changeset/fix-html-dashes-in-element-content.md

@@ -0,0 +1,5 @@
+---
+"@biomejs/biome": patch
+---
+
+Fixed [#9238](https://github.com/biomejs/biome/issues/9238): The HTML parser no longer incorrectly reports `---` inside element content (e.g. `<td>---</td>`) as an "Unexpected value or character" error.

crates/biome_html_parser/src/syntax/mod.rs

@@ -98,9 +98,7 @@ pub(crate) fn parse_root(p: &mut HtmlParser) {
     // Whether or not frontmatter was present, once we're past the frontmatter
     // position `---` can no longer start a fence. This prevents `---` in HTML
     // content from being incorrectly lexed as a FENCE token.
-    if p.options().frontmatter {
-        p.set_after_frontmatter(true);
-    }
+    p.set_after_frontmatter(true);
 
     parse_doc_type(p).ok();
     ElementList.parse_list(p);

crates/biome_html_parser/tests/html_specs/ok/dashes_in_element_content.html

@@ -0,0 +1,14 @@
+<table>
+<thead>
+<tr><th>Name</th><th>Description</th></tr>
+</thead>
+<tbody>
+<tr>
+<td>---</td>
+<td>create a duration of 0ms</td>
+</tr>
+</tbody>
+</table>
+<div>---</div>
+<p>-- text --</p>
+<span>--- some text ---</span>