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Test Info:

<!DOCTYPE html>
<title>Test for bug 1371488</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
<style id="test">
@import url(non-exist-file.css);
<pre id="log">
let sheet = document.getElementById("test").sheet;
let rule = sheet.cssRules[0];
ok(rule, "The import rule should not be null even if the file fails to load");
is(rule.type, CSSRule.IMPORT_RULE, "It is the import rule");
ok(rule.styleSheet, "The associated stylesheet should exists as well");
is(rule.styleSheet.cssRules.length, 0, "The stylesheet should be empty");