| <!DOCTYPE html> |
| <body> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <!-- This iframe will have a sibling that paints, we want to ensure it does not detect that paint. --> |
| <iframe id="listening-iframe" src="resources/subframe-sending-paint.html"></iframe> |
| <script> |
| async_test(function (t) { |
| let paintingIframeHasDispatchedEntries = false; |
| window.addEventListener('message', t.step_func(e => { |
| if (!paintingIframeHasDispatchedEntries) { |
| // Check paint-timing entries from the painting iframe. |
| assert_equals(e.data, '2 paint first-paint paint first-contentful-paint'); |
| paintingIframeHasDispatchedEntries = true; |
| // Ask the listening iframe to send its paint-timing entries. |
| document.getElementById('listening-iframe'). |
| contentWindow.postMessage('', '*'); |
| return; |
| } |
| // Check the paint-timing entries from the listening iframe. |
| assert_equals(e.data, '0'); |
| // Check that current frame receives first-paint but not first-contentful-paint. |
| const bufferedEntries = performance.getEntriesByType('paint'); |
| assert_equals(bufferedEntries.length, 1); |
| assert_equals(bufferedEntries[0].entryType, 'paint'); |
| assert_equals(bufferedEntries[0].name, 'first-paint'); |
| t.done(); |
| })); |
| }, 'Frame ignores paint-timing events fired from sibling frame.'); |
| </script> |
| <!-- This iframe is where all of the painting occurs. --> |
| <iframe id="painting-iframe" src="resources/subframe-painting.html"></iframe> |
| </body> |
| </html> |
