chromium/third_party/blink/perf_tests/bindings/node-list-access.html

<!DOCTYPE html>
<html>
<body>
<script src="../resources/runner.js"></script>
<script>
var div = document.createElement("div");
for (var i = 0; i < 100000; i++)
    div.appendChild(document.createElement("div"));

PerfTestRunner.measureRunsPerSecond({
    description: "This benchmark covers 'childNodes' in Dromaeo/dom-traverse.html, and other DOM attributes that access NodeList.",
    run: function() {
        var childNodes = div.childNodes;
        var length = div.childNodes.length;
        for (var i = 0; i < length; i++)
            childNodes[i];
}});
</script>
</body>
</html>