diff --git a/runtime/syntax/testdir/input/html.html b/runtime/syntax/testdir/input/html.html
new file mode 100644
index 0000000..a4d0eb5
--- /dev/null
+++ b/runtime/syntax/testdir/input/html.html
@@ -0,0 +1,153 @@
+<!--
+  HTML Syntax Test File
+  Maintainer: Doug Kearns <dougkearns@gmail.com>
+  Last Change: 2024 Jun 13
+  VIM_TEST_SETUP let g:html_no_rendering = 1
+
+  TODO: Investigate macOS test failures when comparing italicized text with,
+    for example, <em> and <i> elements.  FreeBSD fails with an empty <strike>
+    element. See #13591 and #14215.
+-->
+
+<!-- HTML Elements -->
+<a></a>
+<abbr></abbr>
+<address></address>
+<area>
+<article></article>
+<aside></aside>
+<audio></audio>
+<b>bring attention to</b>
+<base>
+<bdi></bdi>
+<bdo></bdo>
+<blockquote></blockquote>
+<body></body>
+<br>
+<button></button>
+<canvas></canvas>
+<caption></caption>
+<cite></cite>
+<code></code>
+<col>
+<colgroup></colgroup>
+<data></data>
+<datalist></datalist>
+<dd></dd>
+<del>deleted text</del>
+<details></details>
+<dfn></dfn>
+<dialog></dialog>
+<div></div>
+<dl></dl>
+<dt></dt>
+<em>emphasis</em>
+<embed>
+<fieldset></fieldset>
+<figcaption></figcaption>
+<figure></figure>
+<footer></footer>
+<form></form>
+<h1>Heading Level 1</h1>
+<h2>Heading Level 3</h2>
+<h3>Heading Level 4</h3>
+<h4>Heading Level 4</h4>
+<h5>Heading Level 5</h5>
+<h6>Heading Level 6</h6>
+<head></head>
+<header></header>
+<hgroup></hgroup>
+<hr>
+<html></html>
+<i>idiomatic text</i>
+<iframe></iframe>
+<img>
+<input>
+<ins></ins>
+<kbd></kbd>
+<label></label>
+<legend></legend>
+<li></li>
+<link>
+<main></main>
+<map></map>
+<mark></mark>
+<menu></menu>
+<meta>
+<meter></meter>
+<nav></nav>
+<noscript></noscript>
+<object></object>
+<ol></ol>
+<optgroup></optgroup>
+<option></option>
+<output></output>
+<p></p>
+<picture></picture>
+<pre>preformatted text</pre>
+<progress></progress>
+<q></q>
+<rp></rp>
+<rt></rt>
+<ruby></ruby>
+<!-- FreeBSD failure
+<s>strikethrough</s>
+-->
+<samp></samp>
+<script></script>
+<search></search>
+<section></section>
+<select></select>
+<slot></slot>
+<small></small>
+<source>
+<span></span>
+<strong>strong importance</strong>
+<style></style>
+<sub></sub>
+<summary></summary>
+<sup></sup>
+<table></table>
+<tbody></tbody>
+<td></td>
+<template></template>
+<textarea></textarea>
+<tfoot></tfoot>
+<th></th>
+<thead></thead>
+<time></time>
+<title></title>
+<tr></tr>
+<track>
+<u>unarticulated annotation</u>
+<ul></ul>
+<var></var>
+<video></video>
+<wbr>
+<xmp></xmp>
+
+<!-- Deprecated Elements -->
+<acronym></acronym>
+<big></big>
+<center></center>
+<dir></dir>
+<font></font>
+<frame></frame>
+<frameset></frameset>
+<marquee></marquee>
+<menuitem></menuitem>
+<nobr></nobr>
+<noframes></noframes>
+<param>
+<rb></rb>
+<rtc></rtc>
+<strike>strikethrough</strike>
+<tt></tt>
+
+<!-- Experimental - not highlighted -->
+<portal></portal>
+
+<!-- Note: these deprecated elements have never been matched -->
+<image>
+<noembed>
+<plaintext>
diff --git a/runtime/syntax/testdir/input/html_html b/runtime/syntax/testdir/input/html_html
deleted file mode 100644
index bfeca26..0000000
--- a/runtime/syntax/testdir/input/html_html
+++ /dev/null
@@ -1,146 +0,0 @@
-<!--
-  HTML Syntax Test File
-  Maintainer: Doug Kearns <dougkearns@gmail.com>
-  Last Change: 2023 Nov 28
--->
-
-<!-- HTML Elements -->
-<a>
-<abbr>
-<address>
-<area>
-<article>
-<aside>
-<audio>
-<b>...</b>
-<base>
-<bdi>
-<bdo>
-<blockquote>
-<body>
-<br>
-<button>
-<canvas>
-<caption>
-<cite>
-<code>
-<col>
-<colgroup>
-<data>
-<datalist>
-<dd>
-<del>...</del>
-<details>
-<dfn>
-<dialog>
-<div>
-<dl>
-<dt>
-<em>...</em>
-<embed>
-<fieldset>
-<figcaption>
-<figure>
-<footer>
-<form>
-<h1>...</h1>
-<h2>...</h2>
-<h3>...</h3>
-<h4>...</h4>
-<h5>...</h5>
-<h6>...</h6>
-<head>...</head>
-<header>
-<hgroup>
-<hr>
-<html>
-<i>...</i>
-<iframe>
-<img>
-<input>
-<ins>
-<kbd>
-<label>
-<legend>
-<li>
-<link>
-<main>
-<map>
-<mark>
-<menu>
-<meta>
-<meter>
-<nav>
-<noscript>
-<object>
-<ol>
-<optgroup>
-<option>
-<output>
-<p>
-<picture>
-<pre>...</pre>
-<progress>
-<q>
-<rp>
-<rt>
-<ruby>
-<s>...</s>
-<samp>
-<script>...</script>
-<search>
-<section>
-<select>
-<slot>
-<small>
-<source>
-<span>
-<strong>...</strong>
-<style>...</style>
-<sub>
-<summary>
-<sup>
-<table>
-<tbody>
-<td>
-<template>
-<textarea>
-<tfoot>
-<th>
-<thead>
-<time>
-<title>...</title>
-<tr>
-<track>
-<u>...</u>
-<ul>
-<var>
-<video>
-<wbr>
-<xmp>
-
-<!-- Deprecated Elements -->
-<acronym>
-<big>
-<center>
-<dir>
-<font>
-<frame>
-<frameset>
-<marquee>
-<menuitem>
-<nobr>
-<noframes>
-<param>
-<rb>
-<rtc>
-<strike>...</strike>
-<tt>
-
-<!-- Note: these deprecated elements have never been matched -->
-<image>
-<noembed>
-<plaintext>
-
-<!-- Experimental -->
-<portal>