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Test Info:

<head>
<style><![CDATA[
.green { color: green; }
.toremove { color: red !important; }
]]></style>
</head>
<body>
<div class="foo toremove">
This should be green
</div>
<script>
var div = document.getElementsByTagName("div")[0];
div.classList.toggle("toremove");
div.classList.toggle("green");
</script>
</body>
</html>