observe-background-image.html (1293B)
1 <!DOCTYPE HTML> 2 <meta charset=utf-8> 3 <title>Element Timing: observe element with background image</title> 4 <body> 5 <style> 6 body { 7 margin: 0; 8 } 9 #target { 10 width: 100px; 11 height: 50px; 12 background-image: url('/images/black-rectangle.png'); 13 } 14 </style> 15 <script src="/resources/testharness.js"></script> 16 <script src="/resources/testharnessreport.js"></script> 17 <script src="resources/element-timing-helpers.js"></script> 18 <script> 19 let beforeRender = performance.now(); 20 async_test(function (t) { 21 assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented"); 22 const observer = new PerformanceObserver( 23 t.step_func_done(function(entryList) { 24 assert_equals(entryList.getEntries().length, 1); 25 const entry = entryList.getEntries()[0]; 26 const pathname = window.location.origin + '/images/black-rectangle.png'; 27 checkElement(entry, pathname, 'my_div', 'target', beforeRender, 28 document.getElementById('target')); 29 checkRect(entry, [0, 100, 0, 50]); 30 checkNaturalSize(entry, 100, 50); 31 }) 32 ); 33 observer.observe({entryTypes: ['element']}); 34 }, 'Element with elementtiming attribute and background image is observable.'); 35 </script> 36 <div id='target' elementtiming='my_div'></div> 37 </body>