Run results for: Set Prop Variable vs setAttribute

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser: Chrome 134

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

style.setProperty

122/s

style.setAttribute

96/s

View exact numbers

Test name	Executions per second
✓ style.setProperty	122 Ops/sec
style.setAttribute	96 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++; }