Run results for: CssText vs Styling vs classList add

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:103.0) Gecko/20100101 Firefox/103.0

Browser: Firefox 103

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
csstext	228757.7 Ops/sec
styling	545179.8 Ops/sec
classList add	1879512.5 Ops/sec

HTML Preparation code:

<div id="myid">hi</div>
<style>
    .wide {
      width: 100px;
    }
    .long {
      left: 100px;
      height: 100px;
    }
    .blue {
      top: 100px;
    }
</style>

Script Preparation code:

var a = document.getElementById("myid");
a.style.position = "absolute";

Tests:

csstext
a.style.cssText += "left: 100px ;top: 100px; width: 100px; height: 100px";
styling
a.style.left = "100px" a.style.top = "100px" a.style.width = "100px" a.style.height = "100px"
classList add
a.classList.add('wide','long','blue')

Run results for: CssText vs Styling vs classList add

csstext

styling

classList add