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chromium/chrome/test/data/webapps_integration/not_promotable/basic.html 

<!DOCTYPE html>
<html>
<head>
  <title>Site C</title>
</head>
  <h1>Site C</h1>
  <div>
    <p>
      This site does not have a service worker or manifest on purpose.
    </p>
  </div>
  <div>
    <p>
      This site is used for dPWA integration tests, and is subject to modification to support that framework. See
      <a
        href="https://chromium.googlesource.com/chromium/src/+/main/docs/webapps/integration-testing-framework.md">https://chromium.googlesource.com/chromium/src/+/main/docs/webapps/integration-testing-framework.md</a>
    </p>
  </div>
</body>
</html>