fcp-pseudo-element-image.html (951B)
1 <!DOCTYPE html> 2 <head> 3 <title>Performance Paint Timing Test: FCP due to pseudo-element image</title> 4 <style> 5 #main { 6 position: relative; 7 width: 100px; 8 height: 100px; 9 } 10 11 /* contentful class is defined in test_fcp script. */ 12 #main.contentful:after { 13 content: url(../resources/circles.png); 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"> 22 </div> 23 <script> 24 // Load the image into memory first to make sure it's decoded. 25 function load_image() { 26 const img = document.createElement("img"); 27 img.src = "../resources/circles.png"; 28 29 return new Promise(resolve => { 30 img.onload = async () => resolve(); 31 }); 32 } 33 34 test_fcp("First contentful paint fires due to pseudo-element image.", load_image) 35 </script> 36 </body> 37 38 </html>