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Test Info:

<!DOCTYPE HTML>
<html>
<!--
-->
<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>
<p id="display"><div id="importTarget"></div></p>
<div id="content" style="display: none">
</div>
<pre id="test">
</pre>
</body>
</html>