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Test Info:

<!DOCTYPE html>
<html>
<head>
<style>
span { color: red; }
:-moz-any(:valid) + span { color: green; }
</style>
</head>
<body>
<input required><span>This should be green</span>
<script>
document.body.offsetWidth;
document.getElementsByTagName("input")[0].value = "Test"
</script>
</body>
</html>