File: buffered-does-not-sync-invoke.html

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<!doctype html>
<html>
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>
async_test(function(test) {
    let first_callback_called = false
    let callback_can_run_now = false

    new Promise( (resolve) => {
        new PerformanceObserver( (entries, observer) => {
            first_callback_called = true
            observer.disconnect()
            resolve()
        }).observe({ type: "mark", buffered: true })
    })
    .then( () => {
        new PerformanceObserver ( (entries) => {
            assert_true(callback_can_run_now, "Callback shouldn't be invoked inside the .observe() call")
            test.done()
        }).observe({ type: "mark", buffered: true })
        callback_can_run_now = true
    })
    assert_false(first_callback_called)
    performance.mark('mark')
}, "Buffered PerformanceObservers should not invoke callbacks synchronously.");

</script>
</body>
</html>