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+<!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()">
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1024707">Mozilla Bug 1024707</a>
+
+<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>