fcp-iframe.html | Explore in Territory

<!DOCTYPE html>
<head>
    <title>
        Performance Paint Timing Test: Not only the top level document, paints
        in the iframe should also generate the entry
    </title>
</head>
<body>
<script src="../resources/utils.js"></script>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<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 (e.data.entryType == "paint" && e.data.name == "first-contentful-paint") {
            t.done();
        }
    }));
    const iframe = document.createElement('iframe');
    iframe.src = '../resources/subframe-painting.html';
    document.body.appendChild(iframe);
}, 'Parent frame ignores paint-timing events fired from child image rendering.');
</script>
</body>
</html>

chromium/third_party/blink/web_tests/external/wpt/paint-timing/fcp-only/fcp-iframe.html