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Test Info:

<!doctype html>
<style>
.foo :not(.bar) + baz {
color: red;
}
.descendant::before {
content: "";
}
</style>
<div class="foo">
<div class="descendant">
</div>
</div>
<script>
document.body.offsetTop;
document.querySelector('.foo').classList.remove('foo');
</script>