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Test Info:

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<div id="container" style="width:fit-content; container-type:size;">
<span></span>
<span id="boo" style="display:none;"></span>
</div>
<script>
document.body.offsetTop;
container.style.columnCount = "2";
boo.style.display = "inline";
</script>