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Run results for: className vs. setAttribute vs. classList

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Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.98 Safari/537.36
Chrome 54
Mac OS X 10.11.6
Other
8 years ago
Test name Executions per second
className 3385.7 Ops/sec
classList 925.2 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 bar1 bar2 bar3 bar4";
    }

  • classList

     
    var element = document.getElementById("foo");
    var i = 1000;
    while (i--) {
        element.classList.add("bar");
      element.classList.add("bar1");
      element.classList.add("bar2");
      element.classList.add("bar3");
      element.classList.add("bar4");
    }