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Run results for: setAttribute(...) vs. classList.add(...) vs classList.value vs className

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
Chrome 131
Windows
Desktop
one month ago
Test name Executions per second
setAttribute(...) 108444.5 Ops/sec
classList.add(...) 53317.8 Ops/sec
classList.value 160853.6 Ops/sec
ClassName 220848.3 Ops/sec
HTML Preparation code:
AخA
 
1
<div id="foo"></div>
Tests:

  • setAttribute(...)

     
    var element = document.getElementById("foo");
    var i = 100;
    while (i--) {
        element.setAttribute("class", "bar");
    }

  • classList.add(...)

     
    var element = document.getElementById("foo");
    var i = 100;
    while (i--) {
        element.classList.add("bar");
    }

  • classList.value

     
    var element = document.getElementById("foo");
    var i = 100;
    while (i--) {
        element.classList.value = "bar";
    }

  • ClassName

     
    var element = document.getElementById("foo");
    var i = 100;
    while (i--) {
        element.className = "bar";
    }