MeasureThat.net

Run results for: className vs. classList

Go to the benchmark
Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:85.0) Gecko/20100101 Firefox/85.0
Firefox 85
Windows
Desktop
4 years ago
Test name Executions per second
className 6317.1 Ops/sec
classList 622166.2 Ops/sec
HTML Preparation code:
AخA
 
1
<div class="fus roh dah" id="foo"></div>
Tests:

  • className

     
    var element = document.getElementById("foo");
    var i = 1000;
    while (i--) {
      var hasClass =(" "+element.className+" ").indexOf(" roh ") >= 0;
    }

  • classList

     
    var element = document.getElementById("foo");
    var i = 1000;
    while (i--) {
        var hasClass=element.classList.contains("roh");
    }