gecko-dev/dom/base/test/test_window_define_symbol.html

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<!DOCTYPE html>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1082672
-->
<head>
<meta charset="UTF-8">
<title>Test for Bug 1082672 part 2</title>
<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1082672">Mozilla Bug 1082672</a>
<p id="display"></p>
<div id="content" style="display: none">
</div>
<pre id="test">
<script type="application/javascript">
if (typeof Symbol === "function") {
var sym = Symbol("ponies");
Object.defineProperty(window, sym, {configurable: true, value: 3});
is(window[sym], 3);
} else {
ok(true, "no Symbols in this build");
}
</script>
</pre>
</body>
</html>