HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>designMode iframe</title>
</head>
<body>
  <p>Type inside the iframe below:</p>
  <iframe id="editor" srcdoc="<p>Editable iframe document</p>" width="100%" height="120"></iframe>
  <pre id="out"></pre>
  <script>
    var iframe = document.getElementById("editor");
    iframe.addEventListener("load", function () {
      iframe.contentDocument.designMode = "on";
      document.getElementById("out").textContent =
        "iframe designMode: " + iframe.contentDocument.designMode;
    });
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

Document.designMode — iframe (Try It)