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Test Info:

<!DOCTYPE html>
<html>
<head>
<style>
span { color: red }
:default + span { color: green }
span.reverse { color: green }
:default + span.reverse { color: red }
input { display: none }
</style>
</head>
<body>
<form>
<input type="image"><span>This should be green</span>
</form>
</body>
</html>