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<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onmousedown — inline</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}button{padding:.5rem 1rem;font:inherit;border:1px solid #cbd5e1;border-radius:6px;background:#fff;cursor:pointer}#status{margin-top:1rem;padding:.75rem 1rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;font-size:.875rem;max-width:420px}</style>

</head>

<body>

  <h1>mousedown on button</h1>

  <p>Press the button — the message appears before you release.</p>

  <button type=button onmousedown=handleMouseDown()>Press me</button>

  <p id=status>Waiting for mousedown…</p>



  <script>function handleMouseDown(){document.getElementById("status").textContent="mousedown: Mouse button pressed!",document.getElementById("status").style.background="#f0fdf4",document.getElementById("status").style.borderColor="#bbf7d0"}</script>

</body>

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HTML onmousedown Attribute — Inline handler