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<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Element Timing: do NOT observe elements from cross-origin iframes</title>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/element-timing-helpers.js"></script>
<script>
async_test((t) => {
assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
const observer = new PerformanceObserver(
t.step_func_done((entryList) => {
assert_unreached("We should not observe a cross origin element.");
})
);
observer.observe({entryTypes: ['element']});
// We add the iframe during onload to be sure that the observer is registered
// in time for it to observe the element timing.
// TODO(npm): change observer to use buffered flag.
window.onload = t.step_func(() => {
// Add a cross origin iframe with an image.
const iframe = document.createElement('iframe');
iframe.src = 'http://{{domains[www]}}:{{ports[http][1]}}'
+ '/element-timing/resources/iframe-with-square.html';
document.body.appendChild(iframe);
iframe.onload = t.step_func(() => {
t.step_timeout( () => {
// After some wait, assume observer did not receive the entry, so the test passes.
t.done();
}, 100);
});
});
}, 'Element from cross origin iframe is NOT observable.');
</script>
</body>
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