HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onscroll — throttled page scroll</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}#status{padding:.75rem 1rem;border-radius:8px;font-size:.875rem;font-weight:600;max-width:420px;background:#eff6ff;border:1px solid #bfdbfe;color:#1e40af}.spacer{margin-top:2rem;height:1200px;padding:1rem;border-radius:8px;background:linear-gradient(180deg,#e0f2fe 0,#f0fdf4 100%);color:#64748b;font-size:.875rem}</style>

</head>

<body>

  <h1>Throttled page scroll</h1>

  <p>Scroll this page — progress updates after brief pauses.</p>

  <p id=status aria-live=polite>Page scroll: 0% (0 px)</p>

  <div class=spacer>Keep scrolling down…</div>



  <script>var timer,status=document.getElementById("status");function updateScroll(){var t=window.scrollY||document.documentElement.scrollTop,e=document.documentElement.scrollHeight-window.innerHeight,o=e>0?Math.round(t/e*100):0;status.textContent="Page scroll: "+o+"% ("+Math.round(t)+" px)"}function throttledScroll(){clearTimeout(timer),timer=setTimeout(updateScroll,50)}window.addEventListener("scroll",throttledScroll,{passive:!0}),updateScroll()</script>

</body>

</html>

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HTML onscroll Attribute — throttled page scroll