HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onreset — clear preview</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}form{max-width:420px;padding:1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}label{display:block;margin-bottom:.25rem;font-weight:600;font-size:.875rem}input[type=text]{width:100%;padding:.5rem .75rem;margin-bottom:.75rem;border:1px solid #cbd5e1;border-radius:6px;box-sizing:border-box}input[type=reset]{padding:.5rem 1rem;border:1px solid #cbd5e1;border-radius:6px;background:#fff;cursor:pointer}#preview{margin-top:.75rem;padding:.75rem 1rem;background:#eff6ff;border:1px solid #bfdbfe;border-radius:8px;font-size:.875rem;max-width:420px;min-height:2.5rem}</style>

</head>

<body>

  <h1>Reset + custom preview</h1>

  <p>Type a message — Reset clears fields <em>and</em> the preview below.</p>

  <form id=msgForm>

    <label for=message>Message</label>

    <input id=message name=message placeholder="Type something…">

    <input type=reset value=Reset>

  </form>

  <div id=preview aria-live=polite>Preview: (empty)</div>



  <script>var form=document.getElementById("msgForm"),message=document.getElementById("message"),preview=document.getElementById("preview");message.addEventListener("input",(function(){preview.textContent=message.value?"Preview: "+message.value:"Preview: (empty)"})),form.addEventListener("reset",(function(){setTimeout((function(){preview.textContent="Preview: (empty)",preview.style.background="#f0fdf4",preview.style.borderColor="#bbf7d0"}),0)}))</script>

</body>

</html>

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Live Preview Auto-refresh on Run

HTML onreset Attribute — clear custom preview