| Nicolas Pena | 6e9d51e | 2019-01-30 15:25:00 | [diff] [blame] | 1 | <!DOCTYPE html> |
| 2 | <html> |
| 3 | <meta charset=utf-8 /> |
| 4 | <title>Element Timing: buffer elements before onload</title> |
| 5 | <script src=/resources/testharness.js></script> |
| 6 | <script src=/resources/testharnessreport.js></script> |
| 7 | <script src="resources/element-timing-helpers.js"></script> |
| 8 | <body> |
| 9 | <script> |
| 10 | let beforeRender; |
| Nicolás Peña Moreno | 66bb6b4 | 2019-05-01 17:40:58 | [diff] [blame] | 11 | let img; |
| Nicolas Pena | 6e9d51e | 2019-01-30 15:25:00 | [diff] [blame] | 12 | // Number of characters to be read on the initial read, before sleeping. |
| 13 | // Should be sufficient to do at least a first scan. |
| 14 | let numInitial = 75; |
| 15 | let sleep = 500; |
| 16 | async_test(function(t) { |
| Stephen McGruer | dcfc14d | 2020-04-16 13:23:03 | [diff] [blame] | 17 | assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented"); |
| Nicolás Peña Moreno | 84bcab6 | 2019-03-06 17:00:47 | [diff] [blame] | 18 | const img_src = 'resources/progressive-image.py?name=square20.jpg&numInitial=' |
| 19 | + numInitial + '&sleep=' + sleep; |
| Nicolas Pena | 6e9d51e | 2019-01-30 15:25:00 | [diff] [blame] | 20 | const observer = new PerformanceObserver( |
| 21 | t.step_func_done(function(entryList) { |
| 22 | assert_equals(entryList.getEntries().length, 1); |
| 23 | const entry = entryList.getEntries()[0]; |
| Nicolás Peña Moreno | e42570f | 2019-10-21 21:23:09 | [diff] [blame] | 24 | const pathname = window.location.origin + '/element-timing/' + img_src; |
| Nicolas Pena | 6e9d51e | 2019-01-30 15:25:00 | [diff] [blame] | 25 | // Since the image is only fully loaded after the sleep, the render timestamp |
| 26 | // must be greater than |beforeRender| + |sleep|. |
| Nicolás Peña Moreno | 66bb6b4 | 2019-05-01 17:40:58 | [diff] [blame] | 27 | checkElement(entry, pathname, 'my_image', '', beforeRender + sleep, img); |
| Nicolás Peña Moreno | cf8e881 | 2019-04-01 17:12:02 | [diff] [blame] | 28 | checkNaturalSize(entry, 20, 20); |
| Nicolas Pena | 6e9d51e | 2019-01-30 15:25:00 | [diff] [blame] | 29 | }) |
| 30 | ); |
| 31 | observer.observe({entryTypes: ['element']}); |
| 32 | |
| Nicolás Peña Moreno | 66bb6b4 | 2019-05-01 17:40:58 | [diff] [blame] | 33 | img = document.createElement('img'); |
| Nicolás Peña Moreno | 84bcab6 | 2019-03-06 17:00:47 | [diff] [blame] | 34 | img.src = img_src; |
| Nicolas Pena | 6e9d51e | 2019-01-30 15:25:00 | [diff] [blame] | 35 | img.setAttribute('elementtiming', 'my_image'); |
| 36 | document.body.appendChild(img); |
| 37 | beforeRender = performance.now(); |
| 38 | t.step_timeout(() => {assert_true(0);}, 2000); |
| 39 | }, "Element Timing: image render timestamp occurs after it is fully loaded."); |
| 40 | </script> |
