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<!DOCTYPE HTML>
<meta charset=utf-8>
<title>LongTask Timing: long task in cross-origin sibling iframe</title>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
async_test(t => {
assert_implements(window.PerformanceLongTaskTiming, 'Longtasks are not supported.');
window.addEventListener('message', t.step_func(e => {
assert_equals(e.data['entryType'], 'longtask');
assert_equals(e.data['frame-attribution'], 'cross-origin-unreachable');
assert_equals(e.data['task-attribution'], 'unknown');
assert_equals(e.data['containerType'], 'window');
assert_equals(e.data['containerId'], '');
assert_equals(e.data['containerName'], '');
assert_equals(e.data['containerSrc'], '');
t.done();
}));
const observingFrame = document.createElement('iframe');
observingFrame.id = 'observing-iframe-id';
observingFrame.name = 'observing-iframe-name';
document.body.appendChild(observingFrame);
observingFrame.src = 'resources/subframe-observing-longtask.html'
observingFrame.onload = () => {
/* Create a cross-origin iframe that generates a long task. */
const longtaskFrame = document.createElement('iframe');
longtaskFrame.id = 'longtask-iframe-id';
longtaskFrame.name = 'longtask-iframe-name';
// Simulate cross-origin by using sandbox.
longtaskFrame.sandbox = "allow-scripts";
document.body.appendChild(longtaskFrame);
longtaskFrame.src = 'resources/subframe-with-longtask.html'
};
}, 'Performance longtask entries from cross-origin iframe are observable in its sibling.');
</script>
</body>
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