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chromium/third_party/blink/web_tests/external/wpt/css/css-conditional/container-queries/column-spanner-in-container.html 

<!doctype html>
<title>CSS Container Queries Test: Column-spanner depending on container in column</title>
<link rel="help" href="https://drafts.csswg.org/css-conditional-5/#size-container">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/cq-testcommon.js"></script>
<style>
  #multicol {
    container-type: inline-size;
    width: 600px;
    columns: 2;
    column-gap: 0;
    height: 200px;
  }
  #spanner { height: 100px; }
  @container (width = 600px) {
    #spanner {
      column-span: all;
    }
  }
</style>
<div id="multicol">
  <div id="spanner"></div>
</div>
<script>
  setup(() => assert_implements_container_queries());

  test(() => {
    assert_equals(getComputedStyle(spanner).width, "600px");
  }, "#spanner matching container with column-width 300px, getting column-span:all");

  test(() => {
    multicol.style.width = "500px";
    assert_equals(getComputedStyle(spanner).width, "250px");
  }, "Reducing #multicol width means #spanner no longer gets column-span:all");

  test(() => {
    multicol.style.width = "";
    assert_equals(getComputedStyle(spanner).width, "600px");
  }, "Back to matching 300px and column-span:all");
</script>