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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_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.6 Safari/605.1.15
Safari 17
Mac OS X 10.15.7
Desktop
2 days ago
Test name Executions per second
className 61155.7 Ops/sec
setAttribute 33624.0 Ops/sec
classList 25480.4 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");
    }