Run results for: getBoundingClientRect width vs offset width

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

Access offset properties directly

18.8M/s

getBoundingClientRect

3.8M/s

View exact numbers

Test name	Executions per second
✓ Access offset properties directly	18,771,828 Ops/sec
getBoundingClientRect	3,836,149 Ops/sec

HTML Preparation code:

<div id="el" style="transform: rotateZ(45deg)">
  <h2>Lorem ipsum dolor sit amet</h2>
</div>

Script Preparation code:

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

Tests: