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<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>onclick — event delegation</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 .75rem;font-size:1.25rem;color:#0f172a}#toolbar{display:flex;gap:.5rem;flex-wrap:wrap}button{padding:.5rem .85rem;font:inherit;border:1px solid #cbd5e1;border-radius:6px;background:#fff;cursor:pointer}.log{margin-top:1rem;padding:.75rem 1rem;background:#f0fdf4;border:1px solid #bbf7d0;border-radius:8px;font-size:.8125rem;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>

</head>

<body>

  <h1>Click delegation</h1>

  <p>One listener on <code>#toolbar</code> handles all child button clicks.</p>

  <div id=toolbar>

    <button type=button data-action=edit>Edit</button>

    <button type=button data-action=copy>Copy</button>

    <button type=button data-action=delete>Delete</button>

  </div>

  <div class=log id=log>Click any toolbar button.</div>



  <script>document.getElementById("toolbar").addEventListener("click",(function(t){t.target.matches("button[data-action]")&&(document.getElementById("log").innerHTML="<strong>Delegated click:</strong> action = <code>"+t.target.dataset.action+"</code>")}))</script>

</body>

</html>

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HTML onclick Attribute — Event Delegation