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<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onresize — debounced breakpoint</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}</style>

</head>

<body>

  <h1>Debounced resize handler</h1>

  <p>Resize the window — layout label updates after you stop dragging.</p>

  <p id=status aria-live=polite>Loading…</p>



  <script>var timer,status=document.getElementById("status");function getBreakpoint(e){return e<640?"Mobile":e<1024?"Tablet":"Desktop"}function updateLayout(){var e=window.innerWidth;status.textContent=getBreakpoint(e)+" layout — "+e+" px wide"}function debouncedResize(){clearTimeout(timer),timer=setTimeout(updateLayout,150)}window.addEventListener("resize",debouncedResize),updateLayout()</script>

</body>

</html>

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HTML onresize Attribute — debounced breakpoint