chromium/third_party/blink/perf_tests/bindings/gc-tree.html

<!DOCTYPE html>
<body>
<script src="../resources/runner.js"></script>
<script>
PerfTestRunner.measureTime({
    description: "Measures performance of creating one million divs inside a div, releasing references, then running the garbage collector.",
    run: function() {
        (function() {
            var root = document.createElement("div");
            for (var i = 0; i < 1000000; i++)
                root.appendChild(document.createElement("div"));
        })();
        PerfTestRunner.gc();
    }
});
</script>
</body>