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

<!DOCTYPE html>
<body>
<script src="../resources/runner.js"></script>
<script>
PerfTestRunner.measureTime({
    description: "Measures performance of creating one million divs without retaining references, then running the garbage collector.",
    run: function() {
      (function() {
          for (var i = 0; i < 1000000; i++)
              document.createElement("div");
      })();
      PerfTestRunner.gc();
  }
});
</script>
</body>