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Test Info: Warnings
- This test has a WPT meta file that expects 1 subtest issues.
- This WPT test may be referenced by the following Test IDs:
- /longtask-timing/long-microtask.window.html - WPT Dashboard Interop Dashboard
// META: script=resources/utils.js
async_test(function (t) {
assert_implements(window.PerformanceLongTaskTiming, 'Longtasks are not supported.');
new PerformanceObserver(
t.step_func_done(entryList => {
const entries = entryList.getEntries();
assert_equals(entries.length, 1,
'Exactly one entry is expected.');
const longtask = entries[0];
checkLongTaskEntry(longtask);
t.done();
})
).observe({entryTypes: ['longtask']});
window.onload = () => {
/* Generate a slow microtask */
Promise.resolve().then(() => {
const begin = window.performance.now();
while (window.performance.now() < begin + 60);
});
};
}, 'A short task followed by a long microtask is observable.');