Run results for: Object.assign vs element.style.*

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3 Safari/605.1.15

Browser: Safari 18

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

style.*

371K/s

Object.assign

322K/s

View exact numbers

Test name	Executions per second
✓ style.*	371,467 Ops/sec
Object.assign	321,881 Ops/sec

HTML Preparation code:

<div id="el">
  <h2>Lorem ipsum dolor sit amet</h2>
</div>

Script Preparation code:

var el = document.getElementById("el");

Tests:

Object.assign
Object.assign(el.style, { top: "3px", height: "10px", left: "50px", transition: "left 0.5s ease", });
style.*
el.style.top= "3px"; el.style.height="10px"; el.style.left= "50px"; el.style.transition= "left 0.5s ease";