HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Dynamic as Example</title>
  <link rel="preload" href="/script/demo.js" as="script" id="dynamicLink">
  <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;
    }
    #demo-output {
      margin: 1rem 0;
      padding: 0.75rem 1rem;
      max-width: 480px;
      background: #eff6ff;
      border: 1px solid #bfdbfe;
      border-left: 4px solid #2563eb;
      border-radius: 8px;
      font-size: 0.875rem;
      color: #1e40af;
    }
    #demo-output.is-ready {
      background: #ecfdf5;
      border-color: #a7f3d0;
      border-left-color: #10b981;
      color: #065f46;
    }
    .hint {
      margin-top: 1rem;
      font-size: 0.8125rem;
      color: #64748b;
      max-width: 480px;
    }
  </style>
</head>
<body>
  <h1>Dynamic as</h1>
  <p>This page preloads <code>/script/demo.js</code> with <code>as="script"</code>, then runs it.</p>
  <p id="demo-output">Waiting for demo.js…</p>
  <p class="hint">Open the console too — the script logs when it runs. Valid <code>as</code> values include <code>script</code>, <code>style</code>, <code>font</code>, and <code>image</code>.</p>
  <script>
    var link = document.getElementById("dynamicLink");
    link.setAttribute("as", "script");
    console.log('The "as" attribute is set to:', link.getAttribute("as"));
  </script>
  <script src="/script/demo.js"></script>
</body>
</html>

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HTML as Attribute — Dynamic JavaScript