Code Folding Demo

JavaScript:
 
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/*
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 * Demonstration of code folding
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 */
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window.onload = function() {
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  var te = document.getElementById("code");
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  var sc = document.getElementById("script");
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  te.value = (sc.textContent || sc.innerText || sc.innerHTML).replace(/^\s*/, "");
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  sc.innerHTML = "";
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  var te_html = document.getElementById("code-html");
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  te_html.value = document.documentElement.innerHTML;
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  var te_markdown = document.getElementById("code-markdown");
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  te_markdown.value = "# Foo\n## Bar\n\nblah blah\n\n## Baz\n\nblah blah\n\n# Quux\n\nblah blah\n"
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​
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  window.editor = CodeMirror.fromTextArea(te, {↔});
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  editor.foldCode(CodeMirror.Pos(13, 0));
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​
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  window.editor_html = CodeMirror.fromTextArea(te_html, {
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    mode: "text/html",
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    lineNumbers: true,
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    lineWrapping: true,
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    extraKeys: {"Ctrl-Q": function(cm){ cm.foldCode(cm.getCursor()); }},
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    foldGutter: true,
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    gutters: ["CodeMirror-linenumbers", "CodeMirror-foldgutter"]
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  });
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  editor_html.foldCode(CodeMirror.Pos(0, 0));
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  editor_html.foldCode(CodeMirror.Pos(21, 0));
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​
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  window.editor_markdown = CodeMirror.fromTextArea(te_markdown, {
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    mode: "markdown",
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    lineNumbers: true,
HTML:
xxxxxxxxxx
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<head>↔</head>
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​
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<body>
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<div id="nav">
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  <a href="http://codemirror.net"><img id="logo" src="../doc/logo.png"></a>
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​
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  <ul>
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    <li><a href="/experiments/lib/codemirror-4.4/">Home</a>
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    </li><li><a href="/experiments/lib/codemirror-4.4/doc/manual">Manual</a>
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    </li><li><a href="https://github.com/marijnh/codemirror">Code</a>
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  </li></ul>
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  <ul>
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    <li><a class="active" href="#">Code Folding</a>
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  </li></ul>
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</div>
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​
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<article>
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  <h2>Code Folding Demo</h2>
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  <form>
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    <div style="max-width: 50em; margin-bottom: 1em">JavaScript:<br>
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    <textarea id="code" name="code"></textarea></div>
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    <div style="max-width: 50em; margin-bottom: 1em">HTML:<br>
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    <textarea id="code-html" name="code-html"></textarea></div>
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    <div style="max-width: 50em">Markdown:<br>
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    <textarea id="code-markdown" name="code"></textarea></div>
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  </form>
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  <script id="script"></script>
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</article>
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​
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</body>
Markdown:
xxxxxxxxxx
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# Foo
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## Bar
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​
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blah blah
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​
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## Baz
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​
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blah blah
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​
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# Quux
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​
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blah blah
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​