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Test Info:

<!DOCTYPE HTML>
<html>
<head>
<title>Test for addSheet</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body onload="run()">
<iframe id="iframe1" src="additional_sheets_helper.html"></iframe>
<iframe id="iframe2" src="additional_sheets_helper.html"></iframe>
<pre id="test">
<script type="application/javascript">
let gIOService = SpecialPowers.Cc["@mozilla.org/network/io-service;1"]
.getService(SpecialPowers.Ci.nsIIOService);
let gSSService = SpecialPowers.Cc["@mozilla.org/content/style-sheet-service;1"]
.getService(SpecialPowers.Ci.nsIStyleSheetService);
function test(win, sheet) {
let cs = win.getComputedStyle(win.document.body);
is(cs.getPropertyValue('color'), "rgb(0, 0, 0)", "should have default color");
var windowUtils = SpecialPowers.getDOMWindowUtils(win);
windowUtils.addSheet(sheet, SpecialPowers.Ci.nsIDOMWindowUtils.USER_SHEET);
is(cs.getPropertyValue('color'), "rgb(255, 0, 0)", "should have changed color to red");
}
function run() {
var uri = gIOService.newURI("data:text/css,body{color:red;}");
let sheet = gSSService.preloadSheet(uri, SpecialPowers.Ci.nsIStyleSheetService.USER_SHEET);
test(document.getElementById("iframe1").contentWindow, sheet);
test(document.getElementById("iframe2").contentWindow, sheet);
SimpleTest.finish();
}
SimpleTest.waitForExplicitFinish();
</script>
</body>
</html>