HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>height — dynamic JS</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 1rem;font-size:1.25rem;color:#0f172a}#dynamicElement{padding:1rem;background:#dbeafe;border:1px solid #93c5fd;border-radius:8px;max-width:420px}button{margin-top:.75rem;font:inherit;padding:.45rem .85rem;border:1px solid #cbd5e1;border-radius:6px;background:#2563eb;color:#fff;cursor:pointer}.status{margin-top:.75rem;font-size:.8125rem;color:#64748b;max-width:420px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>height — dynamic JS</h1>
  <div id=dynamicElement>This box height changes when you click the button.</div>
  <button type=button id=resizeBtn>Set height to 120px</button>
  <p class=status id=status>Current height: auto</p>

  <script>
    var box = document.getElementById("dynamicElement");
    var status = document.getElementById("status");
    document.getElementById("resizeBtn").addEventListener("click", function () {
      box.style.height = "120px";
      status.textContent = "Set via style.height = "120px" (CSS). For img/video, use element.height = 200 (number).";
    });
  </script>
</body>
</html>

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HTML height Attribute — Dynamic Height with JavaScript