| <!DOCTYPE HTML> |
| <meta charset=utf-8> |
| <title>Element Timing: observe cross-origin images but without renderTime</title> |
| <body> |
| <style> |
| body { |
| margin: 0; |
| } |
| </style> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/element-timing-helpers.js"></script> |
| <script> |
| async_test((t) => { |
| assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented"); |
| let img; |
| const pathname = 'http://{{domains[www]}}:{{ports[http][1]}}' |
| + '/element-timing/resources/square100.png'; |
| const observer = new PerformanceObserver( |
| t.step_func_done((entryList) => { |
| assert_equals(entryList.getEntries().length, 1); |
| const entry = entryList.getEntries()[0]; |
| checkElement(entry, pathname, 'my_image', 'the_id', 0, img); |
| assert_equals(entry.renderTime, 0, |
| 'The renderTime of a cross-origin image should be 0.'); |
| checkRect(entry, [0, 100, 0, 100]); |
| checkNaturalSize(entry, 100, 100); |
| }) |
| ); |
| observer.observe({entryTypes: ['element']}); |
| // We add the image during onload to be sure that the observer is registered |
| // in time for it to observe the element timing. |
| // TODO(npm): change observer to use buffered flag. |
| window.onload = t.step_func(() => { |
| // Add a cross origin image resource. |
| img = document.createElement('img'); |
| img.src = pathname; |
| img.setAttribute('elementtiming', 'my_image'); |
| img.setAttribute('id', 'the_id'); |
| document.body.appendChild(img); |
| }); |
| }, 'Cross-origin image element is NOT observable.'); |
| </script> |
| |
| </body> |