Benchmark: className vs. setAttribute vs. classList vs. ID vs. dataset

HTML Preparation code:

<div id="foo"></div>

Tests:

className
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.className = "bar"; }
setAttribute
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.setAttribute("class", "bar"); }
classList
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.classList.add("bar"); }
dataset
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.dataset.foo = 'bar'; }
id
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.id = 'bar'; }

Rendered benchmark preparation results:

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className vs. setAttribute vs. classList vs. ID vs. dataset (version: 0)