PerformanceTests/DOM/resources/dom-perf/modify-attribute.js

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// ModifyAttribute - measure attribute modification performance

var ModifyAttribute = {};
var nLoops = 500000;

ModifyAttribute.CreateElementToSetUp = function() {
    return document.createElement('div');
}

ModifyAttribute.ModifyId = function(element) {
    var nLoops = window.nLoops;
    var idValue1 = 'id1';
    var idValue2 = 'id2';

    for (var i = 0; i < nLoops; ++i) {
        element.id = idValue1;
        element.id = idValue2;                        
    }
}

ModifyAttribute.ModifyClass = function(element) {
    var nLoops = window.nLoops;
    var className1 = 'class1';
    var className2 = 'class2';

    for (var i = 0; i < nLoops; ++i) {
        element.className = className1;
        element.className = className2;
    }
}

ModifyAttribute.ModifyTitle = function(element) {
    var nLoops = window.nLoops;
    var title1 = 'title1';
    var title2 = 'title2';

    for (var i = 0; i < nLoops; ++i) {
        element.title = title1;
        element.title = title2;
    }
}

var ModifyAttributeTest = new BenchmarkSuite('ModifyAttribute', [
    new Benchmark("Modify id", ModifyAttribute.ModifyId, ModifyAttribute.CreateElementToSetUp),
    new Benchmark("Modify class", ModifyAttribute.ModifyClass, ModifyAttribute.CreateElementToSetUp),
    new Benchmark("Modify title", ModifyAttribute.ModifyTitle, ModifyAttribute.CreateElementToSetUp)
]);