| <!DOCTYPE HTML> |
| <meta charset=utf-8> |
| <title>Element Timing: image with rotation.</title> |
| <head> |
| <style> |
| body { |
| margin: 0px; |
| } |
| .my_div { |
| width: 100px; |
| height: 50px; |
| transform: rotate(45deg); |
| transform-origin: top left; |
| } |
| </style> |
| </head> |
| <body> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/element-timing-helpers.js"></script> |
| <script> |
| const 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]; |
| const pathname = window.location.origin + '/images/black-rectangle.png'; |
| checkElement(entry, pathname, 'rectangle', 'rect_id', beforeRender, |
| document.getElementById('rect_id')); |
| checkNaturalSize(entry, 100, 50); |
| const rect = entry.intersectionRect; |
| // The div rotates with respect to the origin, so part of it will be invisible. |
| // The width of the visible part will be 100 / sqrt(2) and the height will be |
| // 100 / sqrt(2) + 50 / sqrt(2). |
| assert_equals(rect.left, 0); |
| // Checking precision only to the nearest integer. |
| assert_equals(Math.round(rect.right), 71); |
| assert_equals(rect.top, 0); |
| assert_equals(Math.round(rect.bottom), 106); |
| }) |
| ); |
| observer.observe({entryTypes: ['element']}); |
| }, 'Image intersectionRect is affected by rotation, but not its intrinsic size.'); |
| </script> |
| <div class="my_div" id="div_id"> |
| <img src="/images/black-rectangle.png" elementtiming="rectangle" id="rect_id"/> |
| </div> |
| </body> |