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<!DOCTYPE HTML>
<meta charset=utf-8>
<title>LongTask Timing: long task in nested child iframe</title>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src='resources/utils.js'></script>
<h1>Long Task in Nested Cross-Origin Child Iframe</h1>
<div id="log"></div>
<script>
async_test(function (t) {
assert_implements(window.PerformanceLongTaskTiming, 'Longtasks are not supported.');
const observer = new PerformanceObserver(
t.step_func(function (entryList) {
const entries = entryList.getEntries();
assert_equals(entries.length, 1,
'Exactly one entry is expected.');
const longtask = entries[0];
assert_equals(longtask.entryType, 'longtask');
if (longtask.name == 'self' ||
longtask.name == 'multiple-contexts' ||
longtask.name == 'unknown')
return;
checkLongTaskEntry(longtask, 'cross-origin-descendant');
// Assert the TaskAttributionTiming entry in attribution.
assert_equals(longtask.attribution.length, 1,
'Exactly one attribution entry is expected');
const attribution = longtask.attribution[0];
assert_equals(attribution.entryType, 'taskattribution');
assert_equals(attribution.name, 'unknown');
assert_equals(attribution.duration, 0);
assert_equals(attribution.startTime, 0);
assert_equals(attribution.containerType, 'iframe');
assert_equals(attribution.containerId, 'child-iframe-id');
assert_equals(attribution.containerName, 'child-iframe-name');
assert_equals(attribution.containerSrc,
'resources/subframe-with-longtask.html');
observer.disconnect();
t.done();
})
);
observer.observe({entryTypes: ['longtask']});
window.onload = () => {
const iframe = document.createElement('iframe');
iframe.id = 'child-iframe-id';
iframe.name = 'child-iframe-name';
// Simulate cross-origin by using sandbox.
iframe.sandbox = "allow-scripts";
document.body.appendChild(iframe);
iframe.src = 'resources/subframe-with-longtask.html';
};
}, 'Performance longtask entries in cross-origin child iframe are observable in parent.');
</script>
</body>
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