longtask-sync-xhr.html

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This WPT test may be referenced by the following Test IDs:
- /longtask-timing/longtask-sync-xhr.html - WPT Dashboard Interop Dashboard

<!DOCTYPE HTML>

<meta charset=utf-8>

<title>LongTask Timing: synchronous XHR</title>

<body>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="resources/utils.js"></script>

<h1>Long Task: synchronous XHR</h1>

<div id="log"></div>

<script>

setup(() => assert_implements(window.PerformanceLongTaskTiming, 'Longtasks are not supported.'));

promise_test(async t => {

    const receivedLongTask = new Promise(resolve =>

    new PerformanceObserver(entries => resolve(entries.getEntries())).observe({entryTypes: ['longtask']}));

    await new Promise(resolve => window.addEventListener('load', () => {

        const xhr = new XMLHttpRequest();

        xhr.open('GET', '/resource-timing/resources/delay-css.py?delay=100', false /* synchronous xhr */);

        xhr.send();

        resolve();

    }));

    const entries = await receivedLongTask;

    assert_equals(entries.length, 1);

}, 'A long synchronous XHR is a longtask');

</script>

</body>