stale-css.html (1583B)
1 <!DOCTYPE html> 2 <meta charset="utf-8"> 3 <title>Tests Stale While Revalidate works for css</title> 4 <script src="/resources/testharness.js"></script> 5 <script src="/resources/testharnessreport.js"></script> 6 <script src="/common/utils.js"></script> 7 <body> 8 <script> 9 10 var request_token = token(); 11 let link_src = "./resources/stale-css.py?token=" + request_token; 12 13 let loadLink = async() => { 14 let link = document.createElement("link"); 15 link.rel = "stylesheet"; 16 link.type = "text/css"; 17 link.href = "resources/stale-css.py?token=" + request_token; 18 let loaded = new Promise(r => link.onload = r); 19 document.body.appendChild(link); 20 await loaded; 21 return window 22 .getComputedStyle(document.body) 23 .getPropertyValue('background-color'); 24 }; 25 26 promise_test(async t => { 27 await new Promise(r => window.onload = r); 28 29 let bgColor1 = await loadLink(); 30 assert_equals(bgColor1, "rgb(0, 128, 0)", "(initial version loaded)"); 31 32 let bgColor2 = await loadLink(); 33 assert_equals(bgColor2, "rgb(0, 128, 0)", "(stale version loaded)"); 34 35 // Query the server again and again. At some point it must have received the 36 // revalidation request. We poll, because we don't know when the revalidation 37 // will occur. 38 while(true) { 39 await new Promise(r => step_timeout(r, 25)); 40 let response = await fetch(link_src + "&query"); 41 let count = response.headers.get("Count"); 42 if (count == '2') 43 break; 44 } 45 46 let bgColor3 = await loadLink(); 47 assert_equals(bgColor3, "rgb(255, 0, 0)", "(revalidated version loaded)"); 48 }, 'Cache returns stale resource'); 49 50 </script> 51 </body>