| <!DOCTYPE HTML> |
| <head> |
| <meta charset=utf-8> |
| <title>Element Timing: observe an object containing an image</title> |
| <style> |
| body { |
| margin: 20px; |
| } |
| </style> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/element-timing-helpers.js"></script> |
| <script> |
| async_test(function (t) { |
| let beforeRender; |
| let object; |
| 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/green-100x50.png'; |
| checkElement(entry, pathname, 'my_object', 'rectangle', beforeRender, object); |
| checkRect(entry, [20, 120, 20, 70]); |
| checkNaturalSize(entry, 100, 50); |
| }) |
| ); |
| observer.observe({entryTypes: ['element']}); |
| // We add the object during onload to be sure that the observer is |
| // registered in time for it to observe the element timing. |
| window.onload = () => { |
| // Add object of width equal to 100 and height equal to 50. |
| object = document.createElement('object'); |
| object.type = 'image/png'; |
| object.id = 'rectangle'; |
| object.data = '/images/green-100x50.png'; |
| object.setAttribute('elementtiming', 'my_object'); |
| |
| document.body.appendChild(object); |
| beforeRender = performance.now(); |
| }; |
| }, 'Element with an object containing an image.'); |
| </script> |
| </head> |
