HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>integrity — 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}button{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:520px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px;word-break:break-all}</style>
</head>
<body>
  <h1>Set integrity before fetch</h1>
  <script id=exampleScript src=https://cdn.example.com/example.js crossorigin=anonymous></script>
  <button type=button id=setIntegrityBtn>Set integrity attribute</button>
  <p class=status id=status>integrity must be set before the resource loads for SRI to apply on first fetch.</p>

  <script>document.getElementById("setIntegrityBtn").addEventListener("click",(function(){document.getElementById("exampleScript").setAttribute("integrity","sha256-ExampleHashReplaceWithRealValue"),document.getElementById("status").textContent="Attribute set. For SRI on initial load, set integrity in HTML before the browser requests the file."}))</script>
</body>
</html>

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HTML integrity Attribute — Set integrity with JavaScript