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<!DOCTYPE html>
<html>
<head>
<title>Test for Bug 1371453</title>
<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
<link rel="stylesheet" href="data:text/css,{}">
<body>
<script>
SimpleTest.waitForExplicitFinish();

const Cu = SpecialPowers.Components.utils;

document.styleSheetChangeEventsEnabled = true;

onload = runTest;

async function runTest() {
  const sheet = document.getElementsByTagName("link")[1].sheet;
  sheet.insertRule('@import url("blahblah")', 0);

  const rule = sheet.cssRules[0];
  is(rule.type, CSSRule.IMPORT_RULE, "Got expected import rule.");
  isnot(rule.styleSheet, null, "Import rule contains a stylesheet.");
  isnot(rule.media, null, "Import rule contains a media list.");
  is(rule.href, "blahblah", "Import rule contains expected href.");

  SimpleTest.finish();
}

</script>
</body>
</html>