Run results for: Set Prop Variable vs setAttribute

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

style.setProperty

252/s

style.setAttribute

180/s

View exact numbers

Test name	Executions per second
✓ style.setProperty	252 Ops/sec
style.setAttribute	180 Ops/sec

HTML Preparation code:

<style>
  .id {
    background-color: var(--myVar);
  }
</style>

<div id="test">Some content here</div>

Script Preparation code:

element = document.getElementById("test");

Tests:

style.setProperty
let i = 0; while (i < 10000) { element.style.setProperty("--myVar", "blue"); element.style.setProperty("--myVar", "red"); i++; }
style.setAttribute
let i = 0; while (i < 10000) { element.setAttribute("style", "--myVar: blue"); element.setAttribute("style", "--myVar: red"); i++; }