chromium/third_party/blink/perf_tests/bindings/set-attribute-rare.html

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

PerfTestRunner.measureRunsPerSecond({
    description: "This benchmark covers 'setAttribute' in Dromaeo/dom-attr.html and other DOM methods that return an undefined.",
    run: function() {
        var localDiv = div;
        for (var i = 0; i < 10000; i++)
            localDiv.setAttribute("role", "group");
}});
</script>
</body>
</html>