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chromium/third_party/blink/web_tests/http/tests/css/performance-info-with-cached-sheet.html 

<!DOCTYPE html>
<script src="/js-test-resources/ahem.js"></script>
<link rel="stylesheet" href="resources/has-cached-resources.css">
<script src="resources/url.js"></script>
<script>
if (window.testRunner)
    testRunner.waitUntilDone();

onload = function() {
    // After caching hasCachedResource.css and resources contained by the stylesheet,
    // visit some different page.
    window.location.href = baseURL() + "resources/performance-info-with-cached-sheet-next.html";
}
</script>
<div class="unused"></div>
<div style="font-family: AcidAhemTest">Acid Ahem Test Font</div>