| <!DOCTYPE HTML> |
| <meta charset=utf-8> |
| <title>Element Timing: observe larger element with stretched background image</title> |
| <body> |
| <style> |
| body { |
| margin: 0; |
| } |
| #target { |
| width: 200px; |
| height: 150px; |
| background-image: url('resources/square100.png'); |
| } |
| </style> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="resources/element-timing-helpers.js"></script> |
| <script> |
| let beforeRender = performance.now(); |
| async_test(function (t) { |
| assert_precondition(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 + '/element-timing/resources/square100.png'; |
| checkElement(entry, pathname, 'my_div', 'target', beforeRender, |
| document.getElementById('target')); |
| // The background image extends to occupy to full size of the div. |
| checkRect(entry, [0, 200, 0, 150]); |
| // The natural size of the square remains unchanged. |
| checkNaturalSize(entry, 100, 100); |
| }) |
| ); |
| observer.observe({entryTypes: ['element']}); |
| }, 'Element with background image shows correct image size.'); |
| </script> |
| <div id='target' elementtiming='my_div'></div> |
| </body> |
