<!DOCTYPE HTML> <html> <!-- https://bugzilla.mozilla.org/show_bug.cgi?id=1443344 --> <head> <meta charset="utf-8"> <title>Test for Bug 1443344</title> <script src="/tests/SimpleTest/SimpleTest.js"></script> <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> <script type="application/javascript"> /** Test for Bug 1443344 **/ SimpleTest.waitForExplicitFinish(); var sheetURL = new URL("file_bug1443344.css", location.href); sheetURL.protocol = "http"; var link = document.createElement("link"); link.href = `data:text/css,@import url("${sheetURL}");` link.rel = "stylesheet"; var loadFired = false, errorFired = false; link.onload = () => loadFired = true; link.onerror = () => errorFired = true; document.head.appendChild(link); addLoadEvent(() => { is(loadFired, false, "Should not fire onload for erroring @import"); is(errorFired, true, "Should fire onerror for erroring @import"); is(getComputedStyle($("importTarget")).color, "rgb(0, 255, 0)", "Erroring sheet should not load"); SimpleTest.finish(); }); </script> <style> #importTarget { color: rgb(0, 255, 0); } </style> </head> <body> <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1443344">Mozilla Bug 1443344</a> <p id="display"><div id="importTarget"></div></p> <div id="content" style="display: none"> </div> <pre id="test"> </pre> </body> </html>