HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onscroll — dynamic handler</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}#dynamicElement{width:100%;max-width:360px;height:150px;overflow:auto;border:1px solid #cbd5e1;border-radius:8px;padding:.75rem 1rem;background:#fff}.content{height:500px}#log{margin-top:.75rem;padding:.75rem 1rem;border-radius:8px;font-size:.875rem;max-width:420px;background:#f1f5f9;border:1px solid #e2e8f0;color:#475569}</style>

</head>

<body>

  <h1>element.onscroll</h1>

  <p>Scroll inside the box — the log updates below.</p>



  <div id=dynamicElement>

    <div class=content>

      <p>Scroll inside this element to trigger the event.</p>

      <p>More content here to make it scrollable…</p>

    </div>

  </div>

  <div id=log>Waiting for scroll…</div>



  <script>document.getElementById("dynamicElement").onscroll=function(){var e=document.getElementById("dynamicElement");document.getElementById("log").textContent="Scrolling! Position: "+e.scrollTop+" px",document.getElementById("log").style.background="#eff6ff",document.getElementById("log").style.borderColor="#bfdbfe",document.getElementById("log").style.color="#1e40af"}</script>

</body>

</html>

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HTML onscroll Attribute — dynamic handler