| <!DOCTYPE HTML> |
| <meta charset=utf-8> |
| <title>Element Timing: do NOT observe cross-origin images</title> |
| <body> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/element-timing-helpers.js"></script> |
| <script> |
| async_test((t) => { |
| const observer = new PerformanceObserver( |
| t.step_func_done((entryList) => { |
| assert_unreached("We should not observe a cross origin element."); |
| }) |
| ); |
| 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. |
| const img = document.createElement('img'); |
| img.src = 'http://{{domains[www]}}:{{ports[http][1]}}' |
| + '/element-timing/resources/square100.png'; |
| img.setAttribute('elementtiming', 'my_image'); |
| img.onload = t.step_func(() => { |
| t.step_timeout( () => { |
| // After some wait, assume observer did not receive the entry, so the test passes. |
| t.done(); |
| }, 100); |
| }); |
| document.body.appendChild(img); |
| }); |
| }, 'Cross-origin image element is NOT observable.'); |
| </script> |
| |
| </body> |
