src/third_party/web_platform_tests/XMLHttpRequest/xmlhttprequest-timeout-simple.html

 <!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>XHR2 Timeout Property Tests</title>
    <link rel="help" href="https://xhr.spec.whatwg.org/#the-timeout-attribute" data-tested-assertations="following::ol[1]/li[2]" />
    <link rel="help" href="https://xhr.spec.whatwg.org/#handler-xhr-ontimeout" data-tested-assertations="../.."/>
    <link rel="help" href="https://xhr.spec.whatwg.org/#timeout-error" data-tested-assertations=".."/>
    <link rel="help" href="https://xhr.spec.whatwg.org/#request-error" data-tested-assertations="following::ol[1]/li[9]"/>
    <link rel="help" href="https://xhr.spec.whatwg.org/#infrastructure-for-the-send()-method" data-tested-assertations="following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/.. following-sibling::dl//code[contains(@title,'dom-XMLHttpRequest-timeout')]/../following-sibling::dd following::dt[1] following::dd[1]" />
    <link rel="stylesheet" href="/resources/testharness.css" />
    <meta name=timeout content=long>
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script src="resources/xmlhttprequest-timeout.js"></script>
    <script src="resources/xmlhttprequest-timeout-runner.js"></script>
</head>
<body>
    <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>
    <script src="resources/xmlhttprequest-timeout-simple.js"></script>
</body>
</html>