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Test Info:

<!DOCTYPE html>
Performance Paint Timing Test: Not only the top level document, paints
in the iframe should also generate the entry
<script src="../resources/utils.js"></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
setup({"hide_test_state": true});
async_test(function (t) {
assert_implements(window.PerformancePaintTiming, "Paint Timing isn't supported.");
window.addEventListener('message', t.step_func(e => {
if ( == "paint" && == "first-contentful-paint") {
const iframe = document.createElement('iframe');
iframe.src = '../resources/subframe-painting.html';
}, 'Parent frame ignores paint-timing events fired from child image rendering.');