Run results for: getBoundingClientRect width vs offset width

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_3_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.3.1

Device Platform: Mobile

Date tested: one year ago

Access offset properties directly

24.2M/s

getBoundingClientRect

4.9M/s

View exact numbers

Test name	Executions per second
✓ Access offset properties directly	24,212,294 Ops/sec
getBoundingClientRect	4,911,790 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: