<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=1135812 --> <head> <title>Test for Bug 1135812</title> <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" /> </head> <body> <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1135812">Mozilla Bug 1135812</a> <p id="display"></p> <div id="content" style="display: none"> </div> <pre id="test"> <iframe style="width: 50px;" srcdoc='<picture><source srcset="data:,a" media="(min-width: 150px)" /><source srcset="data:,b" media="(min-width: 100px)" /><img src="data:,c" /></picture>'></iframe> <script> SimpleTest.waitForExplicitFinish(); addEventListener('load', function() { var iframe = document.querySelector('iframe'); var img = iframe.contentDocument.querySelector('img'); is(img.currentSrc, 'data:,c'); img.onload = function() { is(img.currentSrc, 'data:,a'); img.onload = function() { is(img.currentSrc, 'data:,b'); SimpleTest.finish(); } img.onerror = img.onload; iframe.style.width = '120px'; }; img.onerror = img.onload; iframe.style.width = '200px'; }, true); </script> </pre> </body> </html>