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Test Info:
<!DOCTYPE html>
<html>
<style>
input { color: green; }
input.notdefault:default { color: red; }
input.default:not(:default) { color: red; }
</style>
<body>
<input type="submit" form="one" class="notdefault">
<form id="one">
<input type="submit" class="default">
</form>
<script>
document.body.offsetWidth;
document.getElementById("one").id = "two";
</script>
</body>
</html>