fcp-bg-image-set.html (1036B)
1 <!DOCTYPE html> 2 <head> 3 <title>Performance Paint Timing Test: FCP due to background image in image-set</title> 4 <style> 5 #main { 6 width: 100px; 7 height: 100px; 8 } 9 10 /* contentful class is defined in test_fcp script. */ 11 #main.contentful { 12 background-image: -webkit-image-set(url(../resources/circles.png) 1x); 13 background-image: image-set(url(../resources/circles.png) 1x); 14 } 15 </style> 16 </head> 17 <body> 18 <script src="/resources/testharness.js"></script> 19 <script src="/resources/testharnessreport.js"></script> 20 <script src="../resources/utils.js"></script> 21 <div id="main"></div> 22 <script> 23 // Load the image into memory first to make sure it's decoded. 24 function load_image() { 25 const img = document.createElement("img"); 26 img.src = "../resources/circles.png"; 27 28 return new Promise(resolve => { 29 img.onload = async () => resolve(); 30 }); 31 } 32 33 test_fcp("First contentful paint fires due to background image in image-set.", load_image); 34 </script> 35 </body> 36 </html>