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Test Info:

<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<style>
@container (max-width: 500px) {
#target {
display: flex;
}
}
</style>
<div id="container" style="columns:2; container-type:inline-size; width:600px;">
<div id="target"></div>
</div>
<script>
document.body.offsetTop;
container.style.width = "400px";
</script>