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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>crossOrigin JavaScript 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 .75rem;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}pre{margin-top:1rem;background:#0f172a;color:#e2e8f0;padding:1rem;border-radius:8px;overflow-x:auto;font-size:.8125rem}p{font-size:.875rem;color:#64748b;max-width:480px}</style>

</head>

<body>

  <h1>Dynamic script with crossOrigin</h1>

  <button type=button id=loadBtn>Show load code</button>

  <pre id=codeBox>Click the button to see the JavaScript pattern.</pre>



  <script>document.getElementById("loadBtn").addEventListener("click",(function(){document.getElementById("codeBox").textContent='var script = document.createElement("script");\nscript.src = "https://cdn.example.com/app.js";\nscript.crossOrigin = "anonymous";\ndocument.body.appendChild(script);'}))</script>

</body>

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HTML crossorigin Attribute — JavaScript crossOrigin