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Test Info:

<!DOCTYPE html>
<html>
<head>
<style>
span { color: green }
:default:checked + span { color: red }
input { display: none }
</style>
</head>
<body>
<form>
<div>
<input type="submit">
<input type="radio" checked="checked" id="foo">
<span>There should be no red</span>
</div>
</form>
<script>
var foo = document.body.offsetWidth;
document.getElementById("foo").setAttribute("type", "submit");
</script>
</body>
</html>