| Nicolás Peña Moreno | a8d8e61 | 2019-07-08 17:08:11 | [diff] [blame] | 1 | <!DOCTYPE HTML> |
| 2 | <meta charset=utf-8> |
| 3 | <title>Element Timing: observe element with buffered flag</title> |
| 4 | <body> |
| 5 | <style> |
| 6 | body { |
| 7 | margin: 0; |
| 8 | } |
| 9 | </style> |
| 10 | <script src="/resources/testharness.js"></script> |
| 11 | <script src="/resources/testharnessreport.js"></script> |
| 12 | <script src="resources/element-timing-helpers.js"></script> |
| 13 | <script> |
| 14 | async_test(t => { |
| Stephen McGruer | dcfc14d | 2020-04-16 13:23:03 | [diff] [blame] | 15 | assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented"); |
| Nicolás Peña Moreno | a8d8e61 | 2019-07-08 17:08:11 | [diff] [blame] | 16 | const beforeRender = performance.now(); |
| 17 | const img = document.createElement('img'); |
| Nicolás Peña Moreno | a8d8e61 | 2019-07-08 17:08:11 | [diff] [blame] | 18 | // Initial observer used to know when entry has been dispatched |
| 19 | new PerformanceObserver(() => { |
| 20 | // Second observer should require buffered flag to receive the already-dispatched entry. |
| 21 | new PerformanceObserver(t.step_func_done(entryList => { |
| 22 | assert_equals(entryList.getEntries().length, 1); |
| 23 | const entry = entryList.getEntries()[0]; |
| 24 | const pathname = window.location.origin + '/images/black-rectangle.png'; |
| 25 | checkElement(entry, pathname, 'my_image', 'my_id', beforeRender, document.getElementById('my_id')); |
| 26 | // Test that viewport size is at least 100, so element is fully visible. |
| 27 | assert_greater_than_equal(document.documentElement.clientWidth, 100, 'Width should be >= 100'); |
| 28 | assert_greater_than_equal(document.documentElement.clientHeight, 100, 'Height should be >= 100'); |
| 29 | |
| 30 | checkRect(entry, [0, 100, 0, 50]); |
| 31 | checkNaturalSize(entry, 100, 50); |
| 32 | })).observe({type: 'element', buffered: true}); |
| 33 | }).observe({type: 'element'}); |
| 34 | img.src = '/images/black-rectangle.png'; |
| 35 | img.setAttribute('elementtiming', 'my_image'); |
| 36 | img.setAttribute('id', 'my_id'); |
| 37 | document.body.appendChild(img); |
| 38 | }, 'Element Timing entries are observable via buffered flag.'); |
| 39 | </script> |
| 40 | </body> |
