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