MeasureThat.net

Run results for: className vs classList

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Run details:
Mozilla/5.0 (Android 14; Mobile; rv:134.0) Gecko/134.0 Firefox/134.0
Firefox Mobile 134
Android
Mobile
2 months ago
Test name Executions per second
className 2.0 Ops/sec
classList 2449.6 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 ";
    }

  • classList

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