containertiming-body-with-child-img.html (1439B)
1 <!DOCTYPE HTML> 2 <meta charset=utf-8> 3 <title>Container Timing: observe with body node with containertiming and image children</title> 4 <body containertiming='body_ct'> 5 <style> 6 body { 7 margin: 0; 8 } 9 </style> 10 <script src="/resources/testharness.js"></script> 11 <script src="/resources/testharnessreport.js"></script> 12 <script src="/container-timing/resources/container-timing-helpers.js"></script> 13 <script src="/element-timing/resources/element-timing-helpers.js"></script> 14 <script> 15 let beforeRender; 16 let img; 17 async_test(function (t) { 18 assert_implements(window.PerformanceContainerTiming, "PerformanceContainerTiming is not implemented"); 19 const observer = new PerformanceObserver( 20 t.step_func_done(function(entryList) { 21 assert_equals(entryList.getEntries().length, 1); 22 const entry = entryList.getEntries()[0]; 23 checkContainerEntry(entry, 'body_ct', 'img_id', beforeRender) 24 checkRect(entry, [0, 100, 0, 100]) 25 checkContainerSize(entry, 10000); 26 }) 27 ); 28 observer.observe({entryTypes: ['container']}); 29 30 // Add image of width equal to 100 and height equal to 100. 31 const img = document.createElement('img'); 32 img.src = '/container-timing/resources/square100.png'; 33 img.setAttribute('id', 'img_id'); 34 document.body.appendChild(img); 35 36 beforeRender = performance.now(); 37 }, 'Body with containertiming observed reports children image paints.'); 38 </script> 39 40 </body>