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chromium/third_party/blink/web_tests/http/tests/misc/resources/webtiming-two-redirects.html 

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<script src="../../js-test-resources/js-test.js"></script>
</head>
<body>
<p id="description"></p>
<div id="console"></div>
<script>
description("This test checks that Web Timing reports redirectCount correctly and has reasonable values for redirectStart and redirectCount.");

window.performance = window.performance || {};
var navigation = performance.navigation || {};
var timing = performance.timing || {};

shouldBeGreaterThanOrEqual("timing.redirectStart", "timing.navigationStart");
shouldBeGreaterThanOrEqual("timing.redirectEnd", "timing.redirectStart");
shouldBe("navigation.redirectCount", "2");

</script>
</body>
</html>