chromium/third_party/blink/perf_tests/bindings/indexed-getter.html

<!DOCTYPE html>
<html>
<body>
<div id="foo"></div>
<script src="../resources/runner.js"></script>
<script>
for (var i = 0; i < 1000; i++) {
    document.body.appendChild(document.createElement("div"));
}
var divs = document.getElementsByTagName("div");

PerfTestRunner.measureRunsPerSecond({
    description: "This benchmark measures performance of indexed property getters.",
    run: function() {
        var localDivs = divs;
        for (var i = 0; i < 1000; i++)
            localDivs[i];
}});
</script>
</body>
</html>