<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<link rel="help" href="https://bugs.chromium.org/p/chromium/issues/detail?id=1276898">
<style>
  @container (max-width: 500px) {
    #target {
      display: flex;
    }
  }
</style>
<div id="container" style="columns:2; container-type:inline-size; width:400px;">
  <div id="target"></div>
</div>
<script>
  document.body.offsetTop;
  container.style.width = "600px";
</script>
