image-loading-lazy-crossorigin-change.sub.html (1942B)
1 <!DOCTYPE html> 2 <head> 3 <title>Deferred images with loading='lazy' use the latest crossorigin attribute</title> 4 <link rel="author" title="Raj T" href="mailto:rajendrant@chromium.org"> 5 <link rel="author" title="Rob Buis" href="mailto:rbuis@igalia.com"> 6 <script src="/resources/testharness.js"></script> 7 <script src="/resources/testharnessreport.js"></script> 8 <script src="../resources/common.js"></script> 9 </head> 10 11 <script> 12 const img = new ElementLoadPromise("cross-origin"); 13 14 async_test(function(t) { 15 window.addEventListener("load", t.step_func(() => { 16 // At this point the image's #updating-the-image-data algorithm has been 17 // invoked, and the image request has been deferred. The deferred 18 // cross-origin image request was created with the `no-cors` request mode, 19 // which would succeed to load the cross-origin image. 20 // While the request is deferred, we'll set the `crossorigin` attribute to a 21 // value that would cause the image request to fail. Since `crossorigin` 22 // mutations trigger another #updating-the-image-data invocation (replacing 23 // the first one), when we scroll the image into view, the image should be 24 // fetched with the latest `crossorigin` attribute value, and fail to load. 25 img.element().crossOrigin = 'anonymous'; 26 img.element().scrollIntoView(); 27 })); 28 29 img.promise 30 .then(t.unreached_func("The image should not load.")) 31 .catch(t.step_func(() => { img.element().onload = t.step_func_done(); img.element().src = 'resources/image.png'; })); 32 }, "Test that when deferred image is loaded, it uses the latest crossorigin attribute."); 33 </script> 34 35 <body> 36 <div style="height:1000vh;"></div> 37 <img id="cross-origin" loading="lazy" 38 src='http://{{hosts[alt][]}}:{{ports[http][0]}}/html/semantics/embedded-content/the-img-element/resources/image.png' 39 onload="img.resolve();" onerror="img.reject();"> 40 </body>