chromium/third_party/blink/web_tests/http/tests/priorities/resources/preload/as-style.html

<script src="../common.js"></script>
<script>
  observeAndReportResourceLoadPriority(new URL('../../../resources/dummy.css', location));
</script>

<!-- Media-matching style sheets block rendering, and are critical -->
<link rel="preload" as="style" href="../../../resources/dummy.css" onload="reportLoaded()" onerror="reportFailure()">