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Test Info:

<!DOCTYPE html>
Performance Paint Timing Test: Paints in the iframe should be reported in the iframe
and not in the top document
<script src="../resources/utils.js"></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
setup({"hide_test_state": true});
promise_test(async t => {
assert_implements(window.PerformancePaintTiming, "Paint Timing isn't supported.");
const iframe = document.createElement('iframe');
iframe.src = '../resources/subframe-painting.html';
await new Promise(resolve => window.addEventListener('message', e => {
if ( == "paint" && == "first-contentful-paint")
await assertNoFirstContentfulPaint(t);
}, 'Parent frame should not fire own paint-timing events for subframes.');