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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 onload="var foo = document.getElementById('foo');
var bar = document.createElement('input');
bar.type = 'image';
foo.insertBefore(bar, foo.firstChild)">
<form id="foo">
<input type="submit"><span class="reverse">This should be green</span>
</form>
</body>
</html>