| <!DOCTYPE html> |
| <head> |
| <title>Performance Paint Timing Test: child ignores parent FCP</title> |
| </head> |
| <body> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <div id="image"></div> |
| |
| <script> |
| async_test(function (t) { |
| const iframe = document.createElement('iframe'); |
| iframe.id = 'child-iframe'; |
| iframe.src = 'resources/subframe-sending-paint.html'; |
| document.body.appendChild(iframe); |
| window.addEventListener('message', t.step_func(e => { |
| // Child iframe should not have any paint-timing entries. |
| assert_equals(e.data, '0'); |
| t.done(); |
| })); |
| const img = document.createElement('IMG'); |
| img.src = 'resources/circles.png'; |
| img.onload = function() { |
| function testPaintEntries() { |
| const bufferedEntries = performance.getEntriesByType('paint'); |
| if (bufferedEntries.length < 2) { |
| t.step_timeout(testPaintEntries, 20); |
| return; |
| } |
| t.step(function() { |
| assert_equals(bufferedEntries.length, 2, 'There should be two paint timing instances.'); |
| assert_equals(bufferedEntries[0].entryType, 'paint'); |
| assert_equals(bufferedEntries[0].name, 'first-paint'); |
| assert_equals(bufferedEntries[1].entryType, 'paint'); |
| assert_equals(bufferedEntries[1].name, 'first-contentful-paint'); |
| // Ask child iframe to send its paint-timing entries. |
| document.getElementById('child-iframe'). |
| contentWindow.postMessage('', '*'); |
| }) |
| } |
| testPaintEntries(); |
| }; |
| document.getElementById('image').appendChild(img); |
| }, 'Child iframe ignores paint-timing events fired from parent image rendering.'); |
| </script> |
| </body> |
| </html> |
