| Nicolás Peña Moreno | 1d8fa76 | 2019-08-12 21:47:09 | [diff] [blame] | 1 | <!DOCTYPE HTML> |
| 2 | <meta charset=utf-8> |
| 3 | <title>Element Timing: observe element with background image in its first letter</title> |
| 4 | <body> |
| 5 | <style> |
| 6 | #target::first-letter { |
| 7 | background-image: url('/images/black-rectangle.png'); |
| 8 | } |
| Nicolás Peña Moreno | 3061f22 | 2020-01-31 12:23:49 | [diff] [blame] | 9 | #target { |
| 10 | font-size: 12px; |
| 11 | } |
| Nicolás Peña Moreno | 1d8fa76 | 2019-08-12 21:47:09 | [diff] [blame] | 12 | </style> |
| 13 | <script src="/resources/testharness.js"></script> |
| 14 | <script src="/resources/testharnessreport.js"></script> |
| 15 | <script src="resources/element-timing-helpers.js"></script> |
| 16 | <script> |
| 17 | let beforeRender = performance.now(); |
| 18 | async_test(function (t) { |
| Stephen McGruer | dcfc14d | 2020-04-16 13:23:03 | [diff] [blame] | 19 | assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented"); |
| Nicolás Peña Moreno | 1d8fa76 | 2019-08-12 21:47:09 | [diff] [blame] | 20 | const div = document.getElementById('target'); |
| 21 | let textObserved = false; |
| 22 | let imageObserved = false; |
| Nicolás Peña Moreno | 3061f22 | 2020-01-31 12:23:49 | [diff] [blame] | 23 | function calculateSize(entry) { |
| 24 | const ir = entry.intersectionRect; |
| 25 | return (ir.right - ir.left) * (ir.bottom - ir.top); |
| 26 | } |
| Nicolás Peña Moreno | 1d8fa76 | 2019-08-12 21:47:09 | [diff] [blame] | 27 | const observer = new PerformanceObserver( |
| 28 | t.step_func(function(entryList) { |
| 29 | entryList.getEntries().forEach(entry => { |
| 30 | if (entry.name === 'text-paint') { |
| 31 | checkTextElement(entry, 'my_div', 'target', beforeRender, div); |
| 32 | textObserved = true; |
| Nicolás Peña Moreno | 3061f22 | 2020-01-31 12:23:49 | [diff] [blame] | 33 | const size = calculateSize(entry); |
| 34 | // Assume average width is between 4px and 15px. |
| 35 | // Therefore, text size must be between 12 * (35*4) and 12 * (35*15). |
| 36 | assert_between_inclusive(size, 1680, 6300); |
| Nicolás Peña Moreno | 1d8fa76 | 2019-08-12 21:47:09 | [diff] [blame] | 37 | } |
| 38 | else { |
| 39 | assert_equals(entry.name, 'image-paint'); |
| 40 | const pathname = window.location.origin + '/images/black-rectangle.png'; |
| 41 | checkElement(entry, pathname, 'my_div', 'target', beforeRender, div); |
| 42 | checkNaturalSize(entry, 100, 50); |
| 43 | imageObserved = true; |
| Nicolás Peña Moreno | 3061f22 | 2020-01-31 12:23:49 | [diff] [blame] | 44 | const size = calculateSize(entry); |
| 45 | // Background image size should only be approximately the size of a single letter. |
| 46 | assert_between_inclusive(size, 48, 180); |
| Nicolás Peña Moreno | 1d8fa76 | 2019-08-12 21:47:09 | [diff] [blame] | 47 | } |
| 48 | }); |
| 49 | if (textObserved && imageObserved) |
| 50 | t.done(); |
| 51 | }) |
| 52 | ); |
| 53 | observer.observe({entryTypes: ['element']}); |
| 54 | }, 'Element with elementtiming attribute and background image in first-letter is observable.'); |
| 55 | </script> |
| Nicolás Peña Moreno | 3061f22 | 2020-01-31 12:23:49 | [diff] [blame] | 56 | <div id='target' elementtiming='my_div'>This is some text that I care about</div> |
| Nicolás Peña Moreno | 1d8fa76 | 2019-08-12 21:47:09 | [diff] [blame] | 57 | </body> |
