HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>poster — comparison</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}.row{display:flex;flex-wrap:wrap;gap:1.5rem}.col{flex:1 1 200px;max-width:280px}h2{margin:0 0 .5rem;font-size:.9375rem;color:#0f172a}video{display:block;border-radius:8px;width:100%}.hint{font-size:.8125rem;color:#64748b;margin-top:.35rem}</style>

</head>

<body>

  <h1>poster comparison</h1>



  <div class=row>

    <div class=col>

      <h2>With poster</h2>

      <video controls width=240 poster=/images/apple.png>

        <source src=/video/count.mp4 type=video/mp4>

      </video>

      <p class=hint>Shows thumbnail before play.</p>

    </div>



    <div class=col>

      <h2>Without poster</h2>

      <video controls width=240 preload=none>

        <source src=/video/count.mp4 type=video/mp4>

      </video>

      <p class=hint>May look blank until play (preload=none).</p>

    </div>

  </div>

</body>

</html>

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HTML poster Attribute — with vs without