chromium/third_party/blink/perf_tests/layout/attach-inlines-2.html

<!DOCTYPE html>
    <div>
        <span id="span"></span>
    </div>
<script src="../resources/runner.js"></script>
<script>
        var span = document.getElementById("span");

        function test() {
            PerfTestRunner.forceLayout();
            for (var i = 0; i < 10; ++i)
                span.appendChild(document.createElement("span")).textContent = "span";
            PerfTestRunner.forceLayout();
            span.innerHTML = '';
        }

        PerfTestRunner.measureRunsPerSecond({
        description: "Measures performance of attaching a large number of inlines to an attached inline.",
        run: test
        });
</script>
</html>