| <!DOCTYPE HTML> |
| <meta charset=utf-8> |
| <title>Element Timing: observe generated CSS text</title> |
| <style> |
| p::before { |
| content: "Generated text prefix"; |
| } |
| body { |
| margin: 20px; |
| } |
| </style> |
| <body> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/element-timing-helpers.js"></script> |
| <p elementtiming='my_text' id='text_id'></p> |
| <script> |
| async_test(function (t) { |
| const beforeRender = performance.now(); |
| 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_text', 'text_id', beforeRender, document.getElementById('text_id')); |
| assert_equals(entry.intersectionRect.left, 20, 'left should be 20.'); |
| assert_equals(entry.intersectionRect.top, 20, 'top should be 20.'); |
| // Try a lower bound of height=10, width=80 for the generated text. |
| assert_greater_than_equal(entry.intersectionRect.right, 100); |
| assert_greater_than_equal(entry.intersectionRect.bottom, 30); |
| }) |
| ); |
| observer.observe({type: 'element', buffered: true}); |
| }, 'Generated text content is observable.'); |
| </script> |
| </body> |
