xmlhttprequest-timeout-synconmain.html

 <!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>XHR2 Timeout Property Tests</title>
    <link rel="help" href="http://www.w3.org/TR/XMLHttpRequest/#timeout-error" />
    <link rel="stylesheet" href="/w3c/resources/testharness.css" />
    <script src="/w3c/resources/testharness.js"></script>
    <script src="/w3c/resources/testharnessreport.js"></script>
    <script src="xmlhttprequest-timeout.js"></script>
    <script src="xmlhttprequest-timeout-runner.js"></script>
    <script>
        function testXhr() {
            window.addEventListener("message", testResultCallbackHandler);
            var runTests = { "type": "start", "group": groupFromLocation() };
            window.postMessage(runTests, "*");
        };
    </script>
</head>
<body onload="testXhr()">
    <h1>Description</h1>
    <p>This test validates that the XHR2 timeout property behaves as expected in async cases in document (i.e. non-worker) context.</p>
    <div id="log"></div>
</body>
</html>

chromium/third_party/blink/web_tests/http/tests/xmlhttprequest/timeout/xmlhttprequest-timeout-synconmain.html