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async_test( t=> {
for (let i = 0; i < 50; i++)
performance.mark('foo' + i);
let marksCreated = 50;
let marksReceived = 0;
new PerformanceObserver(list => {
marksReceived += list.getEntries().length;
if (marksCreated < 100) {
performance.mark('bar' + marksCreated);
marksCreated++;
}
if (marksReceived == 100)
t.done();
}).observe({type: 'mark', buffered: true});
}, 'PerformanceObserver with buffered flag should see past and future entries.');
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