chromium/third_party/blink/perf_tests/layout/flexbox-deeply-nested-column-flow.html

<!DOCTYPE html>
<script src="../resources/runner.js"></script>
<style>
  .col { display:flex; flex-direction:column; height:100%; }
</style>
<div style="display:flex; width:300px; height:200px;">
  <div>
    <div id="child"></div>
  </div>
  <div class="col">
    <div class="col">
      <div class="col">
        <div class="col">
          <div class="col">
            <div class="col">
              <div class="col">
                <div class="col">
                  <div class="col">
                    <div class="col">
                      <div class="col">
                        <div class="col">
                          <div class="col"></div>
                        </div>
                      </div>
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>
</div>

<script>
function runTest()
{
    document.getElementById("child").style.width = '100px';
    PerfTestRunner.forceLayout();
    document.getElementById("child").style.width = '200px';
    PerfTestRunner.forceLayout();
}

PerfTestRunner.measureRunsPerSecond({
    description: "Layout of sibling of deeply nested column flow flex containers",
    run: runTest,
});
</script>