layout/reftests/bugs/1645549-2.html


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<!DOCTYPE html>
<style>
#flex {
  display: flex;
  flex-flow: column;
}
main {
  column-width: 100px;
}
</style>

<!-- "after" is wrapped in an anonymous flex item. -->
<main>
  <div id="flex"><div>before</div>after</div>
</main>