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<!doctype html>
<html>
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>
promise_test(async t => {
window.onload = () => {
// Trigger a long task.
const begin = window.performance.now();
while (window.performance.now() < begin + 60);
};
assert_implements(window.PerformanceLongAnimationFrameTiming, 'Lon are not supported.');
const entry = await new Promise(resolve => new PerformanceObserver(
t.step_func(entryList => {
const entries = entryList.getEntries();
assert_greater_than_equal(entries.length, 1);
resolve(entries[0]);
})).observe({entryTypes: ["long-animation-frame"]}));
assert_equals(typeof(entry.toJSON), 'function');
const entryJSON = entry.toJSON();
assert_equals(typeof(entryJSON), 'object');
// Check attributes inheritted from PerformanceEntry.
const performanceEntryKeys = [
'name',
'entryType',
'startTime',
'duration',
'renderStart',
'styleAndLayoutStart',
'blockingTime',
'firstUIEventTimestamp'
];
for (const key of performanceEntryKeys) {
assert_equals(entryJSON[key], entry[key],
`entry.toJSON().${key} should match entry.${key}`);
}
}, 'Test toJSON() in PerformanceLongAnimationFrameTiming');
</script>
</body>
</html>
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