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