Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:134.0) Gecko/20100101 Firefox/134.0
Firefox 134
Windows
Desktop
one month ago
Test name Executions per second
className 20742.7 Ops/sec
setAttribute 12570.5 Ops/sec
classList 6670.5 Ops/sec
HTML Preparation code:
AخA
 
1
<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");
    }