| <!DOCTYPE HTML> |
| <meta charset=utf-8> |
| <title>Element Timing: observe elements from same-origin iframes</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) => { |
| if (!window.PerformanceElementTiming) { |
| assert_unreached("PerformanceElementTiming is not implemented"); |
| } |
| let beforeRender; |
| let img; |
| const img_src = 'http://{{domains[www]}}:{{ports[http][1]}}/element-timing/' |
| + 'resources/TAOImage.py?tao=wildcard'; |
| const observer = new PerformanceObserver( |
| t.step_func_done((entryList) => { |
| assert_equals(entryList.getEntries().length, 1); |
| const entry = entryList.getEntries()[0]; |
| checkElement(entry, img_src, 'my_image', 'my_id', beforeRender, img); |
| // Assume viewport has size at least 20, so the element is fully visible. |
| checkRect(entry, [0, 20, 0, 20]); |
| checkNaturalSize(entry, 20, 20); |
| }) |
| ); |
| 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(() => { |
| img = document.createElement('img'); |
| img.src = img_src; |
| img.setAttribute('elementtiming', 'my_image'); |
| img.setAttribute('id', 'my_id'); |
| img.onload = t.step_func(() => { |
| // After a short delay, assume that the entry was not dispatched. |
| t.step_timeout(() => { |
| assert_unreached("Should have received an entry!"); |
| t.done(); |
| }, 100); |
| }); |
| document.body.appendChild(img); |
| beforeRender = performance.now(); |
| }); |
| }, 'Cross-origin element with wildcard TAO is observed.'); |
| </script> |
| |
| </body> |
