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+<!doctype html>
+<html>
+  <head>
+    <title>CodeMirror: Mode-Changing Demo</title>
+    <link rel="stylesheet" href="../lib/codemirror.css">
+    <script src="../lib/codemirror.js"></script>
+    <script src="../mode/javascript/javascript.js"></script>
+    <script src="../mode/scheme/scheme.js"></script>
+    <link rel="stylesheet" href="../doc/docs.css">
+
+    <style type="text/css">
+      .CodeMirror {border: 1px solid black;}
+    </style>
+  </head>
+  <body>
+    <h1>CodeMirror: Mode-Changing demo</h1>
+
+    <form><textarea id="code" name="code">
+;; If there is Scheme code in here, the editor will be in Scheme mode.
+;; If you put in JS instead, it'll switch to JS mode.
+
+(define (double x)
+  (* x x))
+</textarea></form>
+
+<p>On changes to the content of the above editor, a (crude) script
+tries to auto-detect the language used, and switches the editor to
+either JavaScript or Scheme mode based on that.</p>
+
+<script>
+  var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
+    mode: "scheme",
+    lineNumbers: true,
+    matchBrackets: true,
+    tabMode: "indent",
+    onChange: function() {
+      clearTimeout(pending);
+      setTimeout(update, 400);
+    }
+  });
+  var pending;
+  function looksLikeScheme(code) {
+    return !/^\s*\(\s*function\b/.test(code) && /^\s*[;\(]/.test(code);
+  }
+  function update() {
+    editor.setOption("mode", looksLikeScheme(editor.getValue()) ? "scheme" : "javascript");
+  }
+</script>
+  </body>
+</html>