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+<!DOCTYPE HTML>
+<html data-expando-prop="xyz">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=874758
+-->
+<head>
+ <meta charset="utf-8">
+ <title>Test for Bug 874758</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+ <script type="application/javascript">
+
+ /** Test for Bug 874758 **/
+ Object.prototype.expandoProp = 5;
+ is({}.expandoProp, 5, "Should see this on random objects");
+
+ is(document.head.dataset.expandoProp, 5, "Should see this on dataset too");
+ is(document.documentElement.dataset.expandoProp, "xyz",
+ "But if the dataset has it, we should get it from there");
+ </script>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=874758">Mozilla Bug 874758</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+</body>
+</html>