| <!doctype html> |
| <html class="reftest-wait"> |
| <title>Image intrinsic size specified via sizes attribute reacts properly to media changes in Shadow DOM</title> |
| <link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io"> |
| <link rel="match" href="sizes-dynamic-001-ref.html"> |
| <link rel="help" href="https://html.spec.whatwg.org/#sizes-attributes"> |
| <link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1149357"> |
| <script> |
| function frameLoaded(frame) { |
| let doc = frame.contentDocument; |
| let shadow = doc.getElementById("host").attachShadow({ mode: "open" }); |
| |
| let img = doc.createElement("img"); |
| img.srcset = "/images/green-256x256.png 100w"; |
| img.style.maxWidth = "100%"; |
| img.setAttribute("sizes", "(min-width: 400px) 10px, 20px"); |
| |
| img.onload = function() { |
| img.offsetWidth; // Flush layout. |
| |
| frame.width = "500"; |
| |
| // Trigger the viewport resize, which will trigger the image load task. |
| img.offsetWidth; |
| |
| // Wait for the image load task to run. |
| setTimeout(() => document.documentElement.removeAttribute("class"), 0); |
| }; |
| |
| shadow.appendChild(img); |
| } |
| </script> |
| <iframe onload="frameLoaded(this)" width="200" height="500" srcdoc='<!doctype html><div id="host"></div>'></iframe> |
