HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>onresize — 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}#log{padding:.75rem 1rem;border-radius:8px;font-size:.875rem;max-width:420px;background:#f1f5f9;border:1px solid #e2e8f0;color:#475569}</style>

</head>

<body>

  <h1>window.onresize</h1>

  <p>Resize the browser window — the log updates below.</p>

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



  <script>function showSize(){document.getElementById("log").textContent="Resized to "+window.innerWidth+" × "+window.innerHeight+" px",document.getElementById("log").style.background="#eff6ff",document.getElementById("log").style.borderColor="#bfdbfe",document.getElementById("log").style.color="#1e40af"}window.onresize=showSize,showSize()</script>

</body>

</html>

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HTML onresize Attribute — window.onresize