Benchmark Run Result for: className vs. setAttribute vs. classList

HTML Preparation code:

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

Tests:

className
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.className = `bar-${i}`; }
setAttribute
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.setAttribute("class", `bar-${i}`); }
classList
var element = document.getElementById("foo"); var i = 1000; while (i--) { element.classList.add(`bar-${i}`); }
classList remove & add
var element = document.getElementById("foo"); var i = 999; element.classList.add(`bar-1000`); while (i--) { element.classList.remove(`bar-${i+1}`); element.classList.add(`bar-${i}`); }