test_bug874758.html

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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>