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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>integrity — stylesheet</title>
  <link rel=stylesheet href=https://cdn.example.com/styles.css integrity=sha384-abc123ExampleHashReplaceWithRealValueFromSRIHashTool crossorigin=anonymous>
  <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}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:520px}code{background:#e2e8f0;padding:.1rem .35rem;border-radius:4px}</style>
</head>
<body>
  <h1>integrity on &lt;link rel="stylesheet"&gt;</h1>
  <p>SRI works on external stylesheets too. The browser rejects the CSS if the hash does not match.</p>
  <p class=hint>Generate hashes with <code>openssl dgst -sha384 -binary file.css | openssl base64 -A</code> or an SRI hash generator, then prefix with <code>sha384-</code>.</p>
</body>
</html>

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HTML integrity Attribute — Secure Stylesheet