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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>Dynamic compact Example</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}ul{max-width:320px;padding-left:1.5rem}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>
</head>
<body>
  <h1>Dynamic compact list</h1>
  <ul id=dynamicList>
    <li>Item 1</li>
    <li>Item 2</li>
    <li>Item 3</li>
  </ul>
  <script>document.getElementById("dynamicList").compact=!0</script>
  <p class=hint>Assign <code>list.compact = true</code> or use <code>setAttribute("compact", "")</code>. Prefer CSS <code>line-height</code> and <code>margin</code> for new projects.</p>
</body>
</html>

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HTML compact Attribute — Dynamic JavaScript