HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>placeholder — dynamic JS</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}label{display:block;margin-bottom:.35rem;font-weight:500;font-size:.875rem}input{width:100%;max-width:360px;padding:.5rem .65rem;font:inherit;border:1px solid #cbd5e1;border-radius:6px}#status{margin-top:.75rem;padding:.75rem 1rem;border-radius:8px;font-size:.875rem;max-width:360px;background:#f0fdf4;border:1px solid #bbf7d0;color:#166534}</style>

</head>

<body>

  <h1>input.placeholder</h1>

  <label for=dynamicField>Search:</label>

  <input type=search id=dynamicField name=q>



  <p id=status aria-live=polite>placeholder: setting…</p>



  <script>var field=document.getElementById("dynamicField");field.placeholder="Search by product name…",document.getElementById("status").textContent='placeholder set to: "'+field.placeholder+'"'</script>

</body>

</html>

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HTML placeholder Attribute — dynamic JavaScript