diff --git a/runtime/syntax/html.vim b/runtime/syntax/html.vim
index ca7c7f1..0e615b7 100644
--- a/runtime/syntax/html.vim
+++ b/runtime/syntax/html.vim
@@ -5,6 +5,7 @@
 "			Claudio Fleiner <claudio@fleiner.com>
 " Last Change:		2023 Nov 28
 " 2024 Jul 30 by Vim Project: increase syn-sync-minlines to 250
+" 2025 May 10 by Vim Project: update comment
 
 " See :help html.vim for some comments and a description of the options
 
@@ -325,7 +326,8 @@
 endif
 
 " Folding
-" Originally by Ingo Karkat and Marcus Zanona
+" (Originally written by Ingo Karkat and Marcus Zanona; see
+" https://vi.stackexchange.com/questions/2306/html-syntax-folding-in-vim .)
 if get(g:, "html_syntax_folding", 0)
   syn region htmlFold start="<\z(\<\%(area\|base\|br\|col\|command\|embed\|hr\|img\|input\|keygen\|link\|meta\|param\|source\|track\|wbr\>\)\@![a-z-]\+\>\)\%(\_s*\_[^/]\?>\|\_s\_[^>]*\_[^>/]>\)" end="</\z1\_s*>" fold transparent keepend extend containedin=htmlHead,htmlH\d
   " fold comments (the real ones and the old Netscape ones)
diff --git a/runtime/syntax/testdir/dumps/html_fold_expr_00.dump b/runtime/syntax/testdir/dumps/html_fold_expr_00.dump
new file mode 100644
index 0000000..9cd6e83
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/html_fold_expr_00.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/html_fold_expr_01.dump b/runtime/syntax/testdir/dumps/html_fold_expr_01.dump
new file mode 100644
index 0000000..96cc427
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/html_fold_expr_01.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/html_fold_expr_02.dump b/runtime/syntax/testdir/dumps/html_fold_expr_02.dump
new file mode 100644
index 0000000..d2c1ec6
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/html_fold_expr_02.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/html_fold_expr_03.dump b/runtime/syntax/testdir/dumps/html_fold_expr_03.dump
new file mode 100644
index 0000000..74012eb
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/html_fold_expr_03.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/html_fold_expr_04.dump b/runtime/syntax/testdir/dumps/html_fold_expr_04.dump
new file mode 100644
index 0000000..659463c
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/html_fold_expr_04.dump
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diff --git a/runtime/syntax/testdir/dumps/html_fold_expr_05.dump b/runtime/syntax/testdir/dumps/html_fold_expr_05.dump
new file mode 100644
index 0000000..8f3ed16
--- /dev/null
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diff --git a/runtime/syntax/testdir/dumps/html_fold_expr_06.dump b/runtime/syntax/testdir/dumps/html_fold_expr_06.dump
new file mode 100644
index 0000000..97e500f
--- /dev/null
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diff --git a/runtime/syntax/testdir/dumps/html_fold_syntax_00.dump b/runtime/syntax/testdir/dumps/html_fold_syntax_00.dump
new file mode 100644
index 0000000..06611aa
--- /dev/null
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diff --git a/runtime/syntax/testdir/dumps/html_fold_syntax_01.dump b/runtime/syntax/testdir/dumps/html_fold_syntax_01.dump
new file mode 100644
index 0000000..b50223d
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+++ b/runtime/syntax/testdir/dumps/html_fold_syntax_01.dump
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diff --git a/runtime/syntax/testdir/dumps/html_fold_syntax_02.dump b/runtime/syntax/testdir/dumps/html_fold_syntax_02.dump
new file mode 100644
index 0000000..cc0060e
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diff --git a/runtime/syntax/testdir/dumps/html_fold_syntax_03.dump b/runtime/syntax/testdir/dumps/html_fold_syntax_03.dump
new file mode 100644
index 0000000..810f101
--- /dev/null
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diff --git a/runtime/syntax/testdir/dumps/html_fold_syntax_04.dump b/runtime/syntax/testdir/dumps/html_fold_syntax_04.dump
new file mode 100644
index 0000000..b3c4382
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+++ b/runtime/syntax/testdir/dumps/html_fold_syntax_04.dump
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diff --git a/runtime/syntax/testdir/dumps/html_fold_syntax_05.dump b/runtime/syntax/testdir/dumps/html_fold_syntax_05.dump
new file mode 100644
index 0000000..a76fa82
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/html_fold_syntax_05.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/dumps/html_fold_syntax_06.dump b/runtime/syntax/testdir/dumps/html_fold_syntax_06.dump
new file mode 100644
index 0000000..a6b936e
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/html_fold_syntax_06.dump
@@ -0,0 +1,20 @@
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diff --git a/runtime/syntax/testdir/input/html_fold_expr.html b/runtime/syntax/testdir/input/html_fold_expr.html
new file mode 100644
index 0000000..f85e7fa
--- /dev/null
+++ b/runtime/syntax/testdir/input/html_fold_expr.html
@@ -0,0 +1,105 @@
+<!DOCTYPE html>
+<!--
+VIM_TEST_SETUP setlocal foldcolumn=8 foldlevel=8 foldmethod=expr
+
+
+
+-->
+<html lang="en">	<!-- 1 -->
+<HEAD>			<!-- 2 -->
+<meta charset="UTF-8">
+<title>A folding syntax test</title><style> /* 3 FIXME */
+p { font-size: 24px; } /* </style>
+<style>*/</style></head></head></head></head>
+
+<bOdY STYLE="background: #bebebe">	<!-- 2 -->
+<br><br><br><br><script><![CDATA[	// 3
+// \x3C!--
+// \x3Cscript>
+// \x3C/script>
+// -->
+]]></script>
+<h2 id="></h2>"><i>An H2 header</i></h2>
+<br><br><br><br>
+<hr>
+
+<p>Paragraph #1.	<!-- 3 -->
+</p>
+
+<p>Paragraph #2.
+
+<details>		<!-- 3 </details> -->
+<summary>		<!-- 4 </summary> -->
+</summary>
+<p>Paragraph #1.
+<ul>			<!-- 4 -->
+<li>Item a.</li><li>Item b.</li>
+<li>Item c.
+</ul>
+<p>Paragraph #2.	<!-- 4 -->
+</p>
+</details>
+
+<dl>			<!-- 3 -->
+<dt>A quick brown fox jumps over the lazy dog
+<dd>Woof!
+<dl>			<!-- 4 -->
+<dt>A quick brown fox jumps over the lazy dog
+<dd>Woof!
+</dl>
+</dl>
+
+<article>Thread #1	<!-- 3 -->
+<article>Thread #2	<!-- 4 -->
+</article>
+</article>
+
+<p>			<!-- 3 -->
+<label for="selection">Select Option</label>
+<select
+id="selection"
+name="selection">	<!-- 4 -->
+<optgroup label="Primary Group">	<!-- 5 -->
+<option value="1">Alternative
+<option value="2" selected>Default
+<option value="3">Basic
+<option value="4">Extended
+</optgroup>
+</select>
+</p>
+
+<table>			<!-- 3 -->
+<caption>Some Caption</caption>
+<colgroup><col><col><col>
+<thead>
+<tr><th>Header #1<th>Header #2<th>Header #3
+<tbody>
+<tr><td>Column #1<td>Column #2<td>Column #3
+<tr><td>Column #1<td>Column #2<td>Column #3
+<tr><td>Column #1<td>Column #2<td>Column #3
+<tr><td>Column #1<td>Column #2<td>Column #3
+</table>
+
+<div class="block">	<!-- 3 -->
+<blockquote><pre><code>	<!-- 4 -->
+&lt;div class="block"&gt;
+&lt;blockquote&gt;&lt;pre&gt;&lt;code&gt;
+&lt;/code&gt;&lt;/pre&gt;&lt;/blockquote&gt;&lt;/div&gt;
+</code></pre></blockquote></div>
+
+<p>Paragraph #3.</p><p>Paragraph #4.</p><p>Paragraph #5.
+
+<p>Paragraph #6.</p><p>Paragraph #7.</p><p>Paragraph #8.</p><p>Paragraph #9.</p>
+
+<p id="></p>">Paragraph #10.	<!-- 3 -->
+</p>
+
+<p >Paragraph #11.</p><p id="p"
+class="p">Paragraph #12.</p><p
+class="p">Paragraph #13.</p><p
+>Paragraph #14.</p>
+
+<p>Paragraph #15.
+<p>Paragraph #16.
+</BoDy>
+</HTML>
diff --git a/runtime/syntax/testdir/input/html_fold_syntax.html b/runtime/syntax/testdir/input/html_fold_syntax.html
new file mode 100644
index 0000000..73579aa
--- /dev/null
+++ b/runtime/syntax/testdir/input/html_fold_syntax.html
@@ -0,0 +1,105 @@
+<!DOCTYPE html>
+<!--
+VIM_TEST_SETUP let g:html_syntax_folding = 1
+VIM_TEST_SETUP setlocal foldcolumn=8 foldlevel=8 foldmethod=syntax
+
+
+-->
+<html lang="en">	<!-- 1 -->
+<HEAD>			<!-- 2 -->
+<meta charset="UTF-8">
+<title>A folding syntax test</title><style> /* 3 */
+p { font-size: 24px; } /* </style>
+<style>*/</style></head></head></head></head>
+
+<bOdY STYLE="background: #bebebe">	<!-- 2 -->
+<br><br><br><br><script><![CDATA[	// 3
+// \x3C!--
+// \x3Cscript>
+// \x3C/script>
+// -->
+]]></script>
+<h2 id="></h2>"><i>An H2 header</i></h2>
+<br><br><br><br>
+<hr>
+
+<p>Paragraph #1.	<!-- 3 -->
+</p>
+
+<p>Paragraph #2.</p>
+
+<details>		<!-- 3 </details> -->
+<summary>		<!-- 4 </summary> -->
+</summary>
+<p>Paragraph #1.</p>
+<ul>			<!-- 4 FIXME -->
+<li>Item a.</li><li>Item b.</li>
+<li>Item c.</li>
+</ul>
+<p>Paragraph #2.	<!-- 4 FIXME -->
+</p>
+</details>
+
+<dl>			<!-- 3 -->
+<dt>A quick brown fox jumps over the lazy dog</dt>
+<dd>Woof!		<!-- 4 -->
+<dl>			<!-- 5 -->
+<dt>A quick brown fox jumps over the lazy dog</dt>
+<dd>Woof!</dd>
+</dl></dd>
+</dl>
+
+<article>Thread #1	<!-- 3 -->
+<article>Thread #2	<!-- 4 -->
+</article>
+</article>
+
+<p>			<!-- 3 -->
+<label for="selection">Select Option</label>
+<select
+id="selection"
+name="selection">	<!-- 5 -->
+<optgroup label="Primary Group">	<!-- 5 -->
+<option value="1">Alternative</option>
+<option value="2" selected>Default</option>
+<option value="3">Basic</option>
+<option value="4">Extended</option>
+</optgroup>
+</select>
+</p>
+
+<table>			<!-- 3 -->
+<caption>Some Caption</caption>
+<colgroup><col><col><col></colgroup>
+<thead>			<!-- 4 -->
+<tr><th>Header #1</th><th>Header #2</th><th>Header #3</th></tr>
+</thead><tbody>
+<tr><td>Column #1</td><td>Column #2</td><td>Column #3</td></tr>
+<tr><td>Column #1</td><td>Column #2</td><td>Column #3</td></tr>
+<tr><td>Column #1</td><td>Column #2</td><td>Column #3</td></tr>
+<tr><td>Column #1</td><td>Column #2</td><td>Column #3</td></tr>
+</tbody></table>
+
+<div class="block">	<!-- 3 -->
+<blockquote><pre><code>	<!-- 6 -->
+&lt;div class="block"&gt;
+&lt;blockquote&gt;&lt;pre&gt;&lt;code&gt;
+&lt;/code&gt;&lt;/pre&gt;&lt;/blockquote&gt;&lt;/div&gt;
+</code></pre></blockquote></div>
+
+<p>Paragraph #3.</p><p>Paragraph #4.</p><p>Paragraph #5.</p>
+
+<p>Paragraph #6.</p><p>Paragraph #7.</p><p>Paragraph #8.</p><p>Paragraph #9.</p>
+
+<p id="></p>">Paragraph #10.	<!-- 3 FIXME -->
+</p>
+
+<p >Paragraph #11.</p><p id="p"
+class="p">Paragraph #12.</p><p
+class="p">Paragraph #13.</p><p
+>Paragraph #14.</p>
+
+<p>Paragraph #15.	<!-- UNBALANCED! -->
+<p>Paragraph #16.	<!-- UNBALANCED! -->
+</BoDy>
+</HTML>
diff --git a/runtime/syntax/testdir/input/setup/html_fold_expr.vim b/runtime/syntax/testdir/input/setup/html_fold_expr.vim
new file mode 100644
index 0000000..e8daae0
--- /dev/null
+++ b/runtime/syntax/testdir/input/setup/html_fold_expr.vim
@@ -0,0 +1,2 @@
+let g:html_expr_folding = 1
+filetype plugin on