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Test Info: Warnings

<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Event Timing: toJSON</title>
<body>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script src=/resources/testdriver.js></script>
<script src=/resources/testdriver-vendor.js></script>
<script src=resources/event-timing-test-utils.js></script>
<button id='button'>Generate a 'click' event</button>
<script>
async_test(function (t) {
assert_implements(window.PerformanceEventTiming, 'Event Timing is not supported.');
const observer = new PerformanceObserver(
t.step_func_done(function(entryList) {
const entry = entryList.getEntries()[0];
assert_equals(typeof(entry.toJSON), 'function');
const json = entry.toJSON();
assert_equals(typeof(json), 'object');
const keys = [
// PerformanceEntry
'name',
'entryType',
'startTime',
'duration',
// PerformanceEventTiming
'processingStart',
'processingEnd',
'cancelable',
'target',
];
for (const key of keys) {
assert_equals(json[key], entry[key],
'PerformanceEventTiming ${key} entry does not match its toJSON value');
}
})
);
observer.observe({type: 'event'});
clickAndBlockMain('button');
}, 'Test toJSON() in PerformanceEventTiming.');
</script>
</body>