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<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Element Timing: toJSON</title>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/element-timing-helpers.js"></script>
<img elementtiming='img' src="resources/square100.png"/>
<script>
async_test(function (t) {
assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
const observer = new PerformanceObserver(
t.step_func_done(function(entryList) {
assert_equals(entryList.getEntries().length, 1);
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',
// PerformanceElementTiming
'renderTime',
'loadTime',
'intersectionRect',
'identifier',
'naturalWidth',
'naturalHeight',
'id',
'url',
];
for (const key of keys) {
assert_equals(json[key], entry[key],
'PerformanceElementTiming ${key} entry does not match its toJSON value');
}
assert_equals(json['element'], undefined, 'toJSON should not include element');
})
);
observer.observe({type: 'element', buffered: true});
}, 'Test toJSON() in PerformanceElementTiming.');
</script>
</body>
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