chromium/third_party/blink/renderer/core/testing/data/frameserialization/link_integrity.html

<html>
<meta charset="utf8">
<head>
<link rel="stylesheet" href="beautifull.css" integrity="sha256-Y7+RP0LZ3EKKy3OwZSuGNpG1C+PZ9fofRh+n9uuMeQ8=">
<link rel="stylesheet" href="integrityfail.css" integrity="sha256-Y7+RP0LZ3EKKy3OwZSuGNpG1C+PZ9fofRh+n9uuMeQ8=">
<body>
beautifull.css should load because the integrity is provided correctly.
integrityfail.css will not load.
</body>
</html>