HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>designMode on</title>
</head>
<body>
  <p>Click here and type after enabling design mode.</p>
  <pre id="out"></pre>
  <script>
    document.designMode = "on";
    document.getElementById("out").textContent =
      "designMode: " + document.designMode;
  </script>
</body>
</html>

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Document.designMode — turn on (Try It)