| <!DOCTYPE HTML> |
| <head> |
| <meta charset=utf-8> |
| <title>Element Timing: observe element with a content image in a pseudo element</title> |
| <style> |
| body { |
| margin: 20px; |
| } |
| #target { |
| font-size: 12px; |
| } |
| #target::before { |
| content: 'This is text I care about'; |
| } |
| </style> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/element-timing-helpers.js"></script> |
| <script> |
| let beforeRender = performance.now(); |
| async_test(function (t) { |
| assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented"); |
| const observer = new PerformanceObserver( |
| t.step_func_done(function(entryList) { |
| assert_equals(entryList.getEntries().length, 1); |
| const entry = entryList.getEntries()[0]; |
| checkTextElement(entry, 'my_div', 'target', beforeRender, |
| document.getElementById('target')); |
| assert_equals(entry.intersectionRect.left, 20, 'left should be 20.'); |
| // Text box size will vary from device to device, so try lower bounding height by 12, width by 100. |
| assert_greater_than_equal(entry.intersectionRect.right, 120); |
| |
| assert_equals(entry.intersectionRect.top, 20, 'top should be 20.'); |
| assert_greater_than_equal(entry.intersectionRect.bottom, 32); |
| }) |
| ); |
| observer.observe({entryTypes: ['element']}); |
| }, 'Element with elementtiming attribute and a ::before content image is observable.'); |
| </script> |
| </head> |
| <body> |
| <p id='target' elementtiming='my_div'></p> |
| </body> |
