HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>contenteditable vs designMode</title>
</head>
<body>
  <div id="editor" style="border:1px solid #888;padding:8px;min-height:60px;">
    Click and edit this box only.
  </div>
  <pre id="out"></pre>
  <script>
    var box = document.getElementById("editor");
    box.contentEditable = "true";
    document.getElementById("out").textContent =
      "document.designMode still: " + document.designMode + "\n" +
      "box editable: " + box.isContentEditable;
  </script>
</body>
</html>

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contenteditable vs designMode (Try It)