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Test Info:

<!doctype html>↩
<html>↩
<style>↩
div::first-line {↩
--bar: left;↩
}↩
span {↩
animation: var(--bar) 5s infinite alternate;↩
}↩
@keyframes left {↩
from {left: 0;}↩
to {left: 30px;}↩
}↩
</style>↩
<div>↩
<span>Crash</span>↩
</div>↩
</html>↩