observe-svg-background-image.html (1302B)
1 <!DOCTYPE HTML> 2 <meta charset=utf-8> 3 <title>Largest Contentful Paint: observe image.</title> 4 <style> 5 #target { 6 background-image: url('/images/green.svg'); 7 width: 100px; 8 height: 50px; 9 } 10 </style> 11 <body> 12 <script src="/resources/testharness.js"></script> 13 <script src="/resources/testharnessreport.js"></script> 14 <script src="resources/largest-contentful-paint-helpers.js"></script> 15 <script> 16 async_test(function (t) { 17 assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented"); 18 const beforeLoad = performance.now(); 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 let url = window.location.origin + '/images/green.svg'; 24 // green.svg is 100 by 50 25 const size = 100 * 50; 26 checkImage(entry, url, 'target', size, beforeLoad); 27 }) 28 ); 29 observer.observe({type: 'largest-contentful-paint', buffered: true}); 30 t.step_timeout(() => { 31 assert_unreached("The image should have triggered an LCP entry."); 32 t.done(); 33 }, 1000); 34 }, 'Same-origin SVG background image is observable.'); 35 </script> 36 37 <div id="target" width="100" height="50"></div> 38 </body>