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Test Info:

<!DOCTYPE HTML>
<html>
<!--
-->
<head>
<title>Test for Bug 536379</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<link rel="stylesheet" type="text/css" href="data:text/css,p { color: green }">
<link rel="stylesheet" type="text/css" href="data:text/css,p { color: green }">
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=536379">Mozilla Bug 536379</a>
<p id="display"></p>
<pre id="test">
<script type="application/javascript">
/** Test for Bug 536379 **/
const CI = SpecialPowers.Ci;
const CC = SpecialPowers.Cc;
const InspectorUtils = SpecialPowers.InspectorUtils;
var rules = InspectorUtils.getCSSStyleRules(document.getElementById("display"));
var firstPRule = rules[rules.length - 2];
firstPRule.style.removeProperty("color");
ok(true, "should not crash");
var links = document.getElementsByTagName("link");
is(links.length, 3, "links.length");
is(SpecialPowers.unwrap(firstPRule.parentStyleSheet), links[1].sheet, "sheet match for first P rule");
var secondPRule = rules[rules.length - 1];
is(SpecialPowers.unwrap(secondPRule.parentStyleSheet), links[2].sheet, "sheet match for second P rule");
is(links[1].href, links[2].href, "links should have same href");
isnot(links[1].sheet, links[2].sheet, "links should have different sheets");
isnot(firstPRule, secondPRule, "rules should be different");
isnot(firstPRule.cssText, secondPRule.cssText, "text should be different since property was removed from one");
</script>
</pre>
</body>
</html>