diff --git a/runtime/autoload/htmlfold.vim b/runtime/autoload/htmlfold.vim
new file mode 100644
index 0000000..76ccaef
--- /dev/null
+++ b/runtime/autoload/htmlfold.vim
@@ -0,0 +1,192 @@
+" HTML folding script, :h ft-html-plugin
+" Latest Change: 2025 May 10
+" Original Author: Aliaksei Budavei <0x000c70@gmail.com>
+
+function! htmlfold#MapBalancedTags() abort
+  " Describe only _a capturable-name prefix_ for start and end patterns of
+  " a tag so that start tags with attributes spanning across lines can also be
+  " matched with a single call of "getline()".
+  let tag = '\m\c</\=\([0-9A-Za-z-]\+\)'
+  let names = []
+  let pairs = []
+  let ends = []
+  let pos = getpos('.')
+
+  try
+    call cursor(1, 1)
+    let [lnum, cnum] = searchpos(tag, 'cnW')
+
+    " Pair up nearest non-inlined tags in scope.
+    while lnum > 0
+      let name_attr = synIDattr(synID(lnum, cnum, 0), 'name')
+
+      if name_attr ==# 'htmlTag' || name_attr ==# 'htmlScriptTag'
+	let name = get(matchlist(getline(lnum), tag, (cnum - 1)), 1, '')
+
+	if !empty(name)
+	  call insert(names, tolower(name), 0)
+	  call insert(pairs, [lnum, -1], 0)
+	endif
+      elseif name_attr ==# 'htmlEndTag'
+	let name = get(matchlist(getline(lnum), tag, (cnum - 1)), 1, '')
+
+	if !empty(name)
+	  let idx = index(names, tolower(name))
+
+	  if idx >= 0
+	    " Dismiss inlined balanced tags and opened-only tags.
+	    if pairs[idx][0] != lnum
+	      let pairs[idx][1] = lnum
+	      call add(ends, lnum)
+	    endif
+
+	    " Claim a pair.
+	    let names[: idx] = repeat([''], (idx + 1))
+	  endif
+	endif
+      endif
+
+      " Advance the cursor, at "<", past "</a", "<a>", etc.
+      call cursor(lnum, (cnum + 3))
+      let [lnum, cnum] = searchpos(tag, 'cnW')
+    endwhile
+  finally
+    call setpos('.', pos)
+  endtry
+
+  if empty(ends)
+    return {}
+  endif
+
+  let folds = {}
+  let pending_end = ends[0]
+  let level = 0
+
+  while !empty(pairs)
+    let [start, end] = remove(pairs, -1)
+
+    if end < 0
+      continue
+    endif
+
+    if start >= pending_end
+      " Mark a sibling tag.
+      call remove(ends, 0)
+
+      while start >= ends[0]
+	" Mark a parent tag.
+	call remove(ends, 0)
+	let level -= 1
+      endwhile
+
+      let pending_end = ends[0]
+    else
+      " Mark a child tag.
+      let level += 1
+    endif
+
+    " Flatten the innermost inlined folds.
+    let folds[start] = get(folds, start, ('>' . level))
+    let folds[end] = get(folds, end, ('<' . level))
+  endwhile
+
+  return folds
+endfunction
+
+" See ":help vim9-mix".
+if !has("vim9script")
+  finish
+endif
+
+def! g:htmlfold#MapBalancedTags(): dict<string>
+  # Describe only _a capturable-name prefix_ for start and end patterns of
+  # a tag so that start tags with attributes spanning across lines can also be
+  # matched with a single call of "getline()".
+  const tag: string = '\m\c</\=\([0-9A-Za-z-]\+\)'
+  var names: list<string> = []
+  var pairs: list<list<number>> = []
+  var ends: list<number> = []
+  const pos: list<number> = getpos('.')
+
+  try
+    cursor(1, 1)
+    var [lnum: number, cnum: number] = searchpos(tag, 'cnW')
+
+    # Pair up nearest non-inlined tags in scope.
+    while lnum > 0
+      const name_attr: string = synIDattr(synID(lnum, cnum, 0), 'name')
+
+      if name_attr ==# 'htmlTag' || name_attr ==# 'htmlScriptTag'
+	const name: string = get(matchlist(getline(lnum), tag, (cnum - 1)), 1, '')
+
+	if !empty(name)
+	  insert(names, tolower(name), 0)
+	  insert(pairs, [lnum, -1], 0)
+	endif
+      elseif name_attr ==# 'htmlEndTag'
+	const name: string = get(matchlist(getline(lnum), tag, (cnum - 1)), 1, '')
+
+	if !empty(name)
+	  const idx: number = index(names, tolower(name))
+
+	  if idx >= 0
+	    # Dismiss inlined balanced tags and opened-only tags.
+	    if pairs[idx][0] != lnum
+	      pairs[idx][1] = lnum
+	      add(ends, lnum)
+	    endif
+
+	    # Claim a pair.
+	    names[: idx] = repeat([''], (idx + 1))
+	  endif
+	endif
+      endif
+
+      # Advance the cursor, at "<", past "</a", "<a>", etc.
+      cursor(lnum, (cnum + 3))
+      [lnum, cnum] = searchpos(tag, 'cnW')
+    endwhile
+  finally
+    setpos('.', pos)
+  endtry
+
+  if empty(ends)
+    return {}
+  endif
+
+  var folds: dict<string> = {}
+  var pending_end: number = ends[0]
+  var level: number = 0
+
+  while !empty(pairs)
+    const [start: number, end: number] = remove(pairs, -1)
+
+    if end < 0
+      continue
+    endif
+
+    if start >= pending_end
+      # Mark a sibling tag.
+      remove(ends, 0)
+
+      while start >= ends[0]
+	# Mark a parent tag.
+	remove(ends, 0)
+	level -= 1
+      endwhile
+
+      pending_end = ends[0]
+    else
+      # Mark a child tag.
+      level += 1
+    endif
+
+    # Flatten the innermost inlined folds.
+    folds[start] = get(folds, start, ('>' .. level))
+    folds[end] = get(folds, end, ('<' .. level))
+  endwhile
+
+  return folds
+enddef
+
+" vim: fdm=syntax sw=2 ts=8 noet
diff --git a/runtime/doc/filetype.txt b/runtime/doc/filetype.txt
index fa9506d..63d7b03 100644
--- a/runtime/doc/filetype.txt
+++ b/runtime/doc/filetype.txt
@@ -1,4 +1,4 @@
-*filetype.txt*	For Vim version 9.1.  Last change: 2025 Apr 27
+*filetype.txt*	For Vim version 9.1.  Last change: 2025 May 10
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -702,6 +702,32 @@
 Since the text for this plugin is rather long it has been put in a separate
 file: |ft_hare.txt|.
 
+HTML							*ft-html-plugin*
+
+Tag folding poses a few difficulties.  Many elements, e.g. `blockquote`, are
+always delimited by start and end tags; end tags for some elements, e.g. `p`,
+can be omitted in certain contexts; void elements, e.g. `hr`, have no end tag.
+Although the rules for supporting omissible end tags are ad-hoc and involved
+[0], they apply to elements in scope.  Assuming syntactical wellformedness, an
+end tag can be associated with its nearest matching start tag discoverable in
+scope [1] and towards the beginning of a file, whereas all unbalanced tags and
+inlined tags can be disregarded.  Having syntax highlighting in effect, tag
+folding using the |fold-expr| method can be enabled with: >
+	let g:html_expr_folding = 1
+<
+By default, tag folding will be redone from scratch after each occurrence of
+a |TextChanged| or an |InsertLeave| event.  Such frequency may not be desired,
+especially for large files, and this recomputation can be disabled with: >
+	let g:html_expr_folding_without_recomputation = 1
+        doautocmd FileType
+<
+To force another recomputation, do: >
+	unlet! b:foldsmap
+	normal zx
+<
+[0] https://html.spec.whatwg.org/multipage/syntax.html#optional-tags
+[1] https://en.wikipedia.org/wiki/Dangling_else
+
 IDRIS2							*ft-idris2-plugin*
 
 By default the following options are set: >
diff --git a/runtime/doc/tags b/runtime/doc/tags
index ae80f0e..b820c96 100644
--- a/runtime/doc/tags
+++ b/runtime/doc/tags
@@ -7404,6 +7404,7 @@
 ft-help-omni	helphelp.txt	/*ft-help-omni*
 ft-html-indent	indent.txt	/*ft-html-indent*
 ft-html-omni	insert.txt	/*ft-html-omni*
+ft-html-plugin	filetype.txt	/*ft-html-plugin*
 ft-html-syntax	syntax.txt	/*ft-html-syntax*
 ft-htmlos-syntax	syntax.txt	/*ft-htmlos-syntax*
 ft-ia64-syntax	syntax.txt	/*ft-ia64-syntax*
diff --git a/runtime/ftplugin/html.vim b/runtime/ftplugin/html.vim
index 5495f85..7736b5b 100644
--- a/runtime/ftplugin/html.vim
+++ b/runtime/ftplugin/html.vim
@@ -3,7 +3,8 @@
 " Maintainer:		Doug Kearns <dougkearns@gmail.com>
 " Previous Maintainer:	Dan Sharp
 " Last Change:		2024 Jan 14
-" 			2024 May 24 by Riley Bruins <ribru17@gmail.com> ('commentstring')
+" 2024 May 24 update 'commentstring' option
+" 2025 May 10 add expression folding #17141
 
 if exists("b:did_ftplugin")
   finish
@@ -56,5 +57,52 @@
   let b:undo_ftplugin ..= " | unlet! b:browsefilter b:html_set_browsefilter"
 endif
 
+if has("folding") && get(g:, "html_expr_folding", 0)
+  function! HTMLTagFold() abort
+    if empty(get(b:, "foldsmap", {}))
+      if empty(get(b:, "current_syntax", ''))
+	return '0'
+      else
+	let b:foldsmap = htmlfold#MapBalancedTags()
+      endif
+    endif
+
+    return get(b:foldsmap, v:lnum, '=')
+  endfunction
+
+  setlocal foldexpr=HTMLTagFold()
+  setlocal foldmethod=expr
+  let b:undo_ftplugin ..= " | setlocal foldexpr< foldmethod<"
+
+  if !get(g:, "html_expr_folding_without_recomputation", 0)
+    augroup htmltagfold
+      autocmd! htmltagfold
+      autocmd TextChanged,InsertLeave <buffer> let b:foldsmap = {}
+    augroup END
+
+    " XXX: Keep ":autocmd" last in "b:undo_ftplugin" (see ":help :bar").
+    let b:undo_ftplugin ..= " | silent! autocmd! htmltagfold * <buffer>"
+  endif
+endif
+
 let &cpo = s:save_cpo
 unlet s:save_cpo
+
+" See ":help vim9-mix".
+if !has("vim9script")
+  finish
+endif
+
+if exists("*g:HTMLTagFold")
+  def! g:HTMLTagFold(): string
+    if empty(get(b:, "foldsmap", {}))
+      if empty(get(b:, "current_syntax", ''))
+	return '0'
+      else
+	b:foldsmap = g:htmlfold#MapBalancedTags()
+      endif
+    endif
+
+    return get(b:foldsmap, v:lnum, '=')
+  enddef
+endif
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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+| +0#0000e05#a8a8a8255@7| +0#0000000#ffffff0@66
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+||+0#0000e05#a8a8a8255@2| @4|/+0&#ffffff0@1| |\|x|3|C|!|-@1| +0#0000000&@56
+||+0#0000e05#a8a8a8255@2| @4|/+0&#ffffff0@1| |\|x|3|C|s|c|r|i|p|t|>| +0#0000000&@52
+||+0#0000e05#a8a8a8255@2| @4|/+0&#ffffff0@1| |\|x|3|C|/|s|c|r|i|p|t|>| +0#0000000&@51
+@57|1|,|1| @10|T|o|p| 
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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+||+0#0000e05#a8a8a8255@2| @4|/+0&#ffffff0@1| |\|x|3|C|!|-@1| +0#0000000&@56
+||+0#0000e05#a8a8a8255@2| @4|/+0&#ffffff0@1| |\|x|3|C|s|c|r|i|p|t|>| +0#0000000&@52
+||+0#0000e05#a8a8a8255@2| @4>/+0&#ffffff0@1| |\|x|3|C|/|s|c|r|i|p|t|>| +0#0000000&@51
+||+0#0000e05#a8a8a8255@2| @4|/+0&#ffffff0@1| |-@1|>| +0#0000000&@60
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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
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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
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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
--- /dev/null
+++ 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
--- /dev/null
+++ b/runtime/syntax/testdir/dumps/html_fold_syntax_02.dump
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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
+++ b/runtime/syntax/testdir/dumps/html_fold_syntax_03.dump
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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
--- /dev/null
+++ 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
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+||+0#0000e05#a8a8a8255@1| @5|<+0#00e0e07#ffffff0|p+0#af5f00255&| +0#00e0e07&|i+0#00e0003&|d|=+0#00e0e07&|"+0#e000002&|>|<|/|p|>|"+0#0000000&|>+0#ffffff16#ff404010|P+0#0000000#ffffff0|a|r|a|g|r|a|p|h| |#|1|0|.| @3|<+0#0000e05&|!|-@1| |3| |F|I|X|M|E| |-@1|>| +0#0000000&@18
+||+0#0000e05#a8a8a8255@1| @5|<+0#00e0e07#ffffff0|/|p+0#af5f00255&|>+0#00e0e07&| +0#0000000&@62
+||+0#0000e05#a8a8a8255@1| @5| +0#0000000#ffffff0@66
+||+0#0000e05#a8a8a8255@1| @5|<+0#00e0e07#ffffff0|p+0#af5f00255&| +0#00e0e07&|>|P+0#0000000&|a|r|a|g|r|a|p|h| |#|1@1|.|<+0#00e0e07&|/|p+0#af5f00255&|>+0#00e0e07&|<+0#0000000&|p| |i|d|=|"|p|"| @35
+||+0#0000e05#a8a8a8255@1| @5|c+0#0000000#ffffff0|l|a|s@1|=|"|p|"|>+0#ffffff16#ff404010|P+0#0000000#ffffff0|a|r|a|g|r|a|p|h| |#|1|2|.|<+0#00e0e07&|/|p+0#af5f00255&|>+0#00e0e07&|<+0#0000000&|p| @36
+||+0#0000e05#a8a8a8255@1| @5|c+0#0000000#ffffff0|l|a|s@1|=|"|p|"|>+0#ffffff16#ff404010|P+0#0000000#ffffff0|a|r|a|g|r|a|p|h| |#|1|3|.|<+0#00e0e07&|/|p+0#af5f00255&|>+0#00e0e07&|<+0#0000000&|p| @36
+||+0#0000e05#a8a8a8255@1| @5|>+0#ffffff16#ff404010|P+0#0000000#ffffff0|a|r|a|g|r|a|p|h| |#|1|4|.|<+0#00e0e07&|/|p+0#af5f00255&|>+0#00e0e07&| +0#0000000&@47
+||+0#0000e05#a8a8a8255@1| @5| +0#0000000#ffffff0@66
+||+0#0000e05#a8a8a8255@1|-| @4|<+0#00e0e07#ffffff0|p+0#af5f00255&|>+0#00e0e07&|P+0#0000000&|a|r|a|g|r|a|p|h| |#|1|5|.| @6|<+0#0000e05&|!|-@1| |U|N|B|A|L|A|N|C|E|D|!| |-@1|>| +0#0000000&@22
+||+0#0000e05#a8a8a8255@2|-| @3|<+0#00e0e07#ffffff0|p+0#af5f00255&|>+0#00e0e07&|P+0#0000000&|a|r|a|g|r|a|p|h| |#|1|6|.| @6|<+0#0000e05&|!|-@1| |U|N|B|A|L|A|N|C|E|D|!| |-@1|>| +0#0000000&@22
+@57|9|1|,|0|-|1| @7|9|7|%| 
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 @@
+||+0#0000e05#a8a8a8255@2|-| @3|<+0#00e0e07#ffffff0|p+0#af5f00255&|>+0#00e0e07&|P+0#0000000&|a|r|a|g|r|a|p|h| |#|1|6|.| @6|<+0#0000e05&|!|-@1| |U|N|B|A|L|A|N|C|E|D|!| |-@1|>| +0#0000000&@22
+||+0#0000e05#a8a8a8255@3| @3|<+0#00e0e07#ffffff0|/|B+0#af5f00255&|o|D|y|>+0#00e0e07&| +0#0000000&@59
+||+0#0000e05#a8a8a8255@3| @3><+0#00e0e07#ffffff0|/|H+0#af5f00255&|T|M|L|>+0#00e0e07&| +0#0000000&@59
+|~+0#4040ff13&| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+|~| @73
+| +0#0000000&@56|1|0|5|,|1| @8|B|o|t| 
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