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Test Info:

<!DOCTYPE html>
<link rel="help" href="crbug.com/394980089">
<style>
#scroller { overflow: scroll; scroll-marker-group: after; }
#item::scroll-marker { content: "X" }
</style>
<div id="scroller">
<canvas>
<div id="item">You don't see me</div>
</canvas>
</div>