<!DOCTYPE html>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<style>
  #keg { contain: inline-size layout; }
  @container (max-width: 200px) {
    #target { height: 400px; }
  }
  @container (min-width: 400px) {
    #target { height: 20px; }
  }
</style>
<div id="ancestry">
  <div id="keg">
    <div id="target">
      <div style="height:50px;"></div>
    </div>
  </div>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
  test(()=> {
      ancestry.style.width = "100px";
      assert_equals(keg.offsetHeight, 400);

      ancestry.style.width = "300px";
      assert_equals(keg.offsetHeight, 50);

      ancestry.style.width = "500px";
      assert_equals(keg.offsetHeight, 20);
  }, "inline-size containment only");
</script>