| <!DOCTYPE HTML> |
| <meta charset=utf-8> |
| <title>Element Timing: observe text with display style.</title> |
| <body> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/element-timing-helpers.js"></script> |
| <style> |
| h1 { |
| display: flex; |
| } |
| h2 { |
| display: grid; |
| } |
| h3 { |
| display: block; |
| } |
| </style> |
| <h1 id='title1' elementtiming='h1'>I am h1</h1> |
| <h2 id='title2' elementtiming='h2'>I am h2</h2> |
| <h3 id='title3' elementtiming='h3'>I am h3</h3> |
| <script> |
| async_test(function (t) { |
| if (!window.LargestContentfulPaint) { |
| assert_unreached("LargestContentfulPaint is not implemented"); |
| } |
| const beforeRender = performance.now(); |
| let observedFlex = false; |
| let observedGrid = false; |
| let observedBlock = false; |
| const observer = new PerformanceObserver( |
| t.step_func(function(entryList) { |
| entryList.getEntries().forEach(entry => { |
| if (entry.id === 'title1') { |
| assert_false(observedFlex, 'Should observe flex once'); |
| observedFlex = true; |
| checkTextElement(entry, 'h1', 'title1', beforeRender, document.getElementById('title1')); |
| } else if (entry.id === 'title2') { |
| assert_false(observedGrid, 'Should observe grid once'); |
| observedGrid = true; |
| checkTextElement(entry, 'h2', 'title2', beforeRender, document.getElementById('title2')); |
| } else { |
| assert_equals(entry.id, 'title3', 'ID should be title1, title2, or title3'); |
| assert_false(observedBlock, 'Should observe block once'); |
| observedBlock = true; |
| checkTextElement(entry, 'h3', 'title3', beforeRender, document.getElementById('title3')); |
| } |
| }); |
| if (observedFlex && observedGrid && observedBlock) |
| t.done(); |
| }) |
| ); |
| observer.observe({type: 'element', buffered: true}); |
| }, 'Text with display style is observable.'); |
| </script> |
| </body> |