HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Toggle contenteditable</title>
  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 1rem;font-size:1.25rem;color:#0f172a}button{font:inherit;padding:.45rem .85rem;border:1px solid #cbd5e1;border-radius:6px;background:#2563eb;color:#fff;cursor:pointer;margin-bottom:.75rem}#editableElement{max-width:480px;padding:.85rem 1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}#editableElement[contenteditable=true]{border-color:#93c5fd;box-shadow:0 0 0 2px rgba(37,99,235,.15)}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:480px}</style>
</head>
<body>
  <h1>Toggle editable mode</h1>
  <button type=button onclick=toggleEditable()>Toggle Editable</button>
  <div id=editableElement>
    <p>This content can be dynamically edited.</p>
  </div>
  <script>function toggleEditable(){var e=document.getElementById("editableElement");e.contentEditable="true"===e.contentEditable?"false":"true"}</script>
  <p class=hint>The DOM property is <code>contentEditable</code> (capital E). It returns the strings <code>"true"</code> or <code>"false"</code>.</p>
</body>
</html>

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HTML contenteditable Attribute — Toggle with JavaScript