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Test Info:

async_test(t => {
performance.mark('foo');
t.step_timeout(() => {
// After a timeout, PerformanceObserver should still receive entry if using the buffered flag.
new PerformanceObserver(t.step_func_done(list => {
const entries = list.getEntries();
assert_equals(entries.length, 1, 'There should be 1 mark entry.');
assert_equals(entries[0].entryType, 'mark');
})).observe({type: 'mark', buffered: true});
}, 100);
}, 'PerformanceObserver with buffered flag sees entry after timeout');