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async_test(t => {
performance.clearResourceTimings();
// First observer creates second in callback to ensure the entry has been dispatched by the time
// the second observer begins observing.
new PerformanceObserver(() => {
// Second observer requires 'buffered: true' to see an entry.
new PerformanceObserver(t.step_func_done(list => {
const entries = list.getEntries();
assert_equals(entries.length, 1, 'There should be 1 resource entry.');
assert_equals(entries[0].entryType, 'resource');
assert_greater_than(entries[0].startTime, 0);
assert_greater_than(entries[0].responseEnd, entries[0].startTime);
assert_greater_than(entries[0].duration, 0);
assert_true(entries[0].name.endsWith('resources/empty.js'));
})).observe({'type': 'resource', buffered: true});
}).observe({'entryTypes': ['resource']});
fetch('resources/empty.js');
}, 'PerformanceObserver with buffered flag sees previous resource entries.');
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