Run results for: clientHeight vs offsetHeight vs getBoundingClientRect

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/123.0.6312.52 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 123

Operating system: iOS 17.4

Device Platform: Mobile

Date tested: 2 years ago

offsetWidth / offsetHeight

7.3M/s

clientWidth / clientHeight

6.4M/s

getBoundingClientRect

3.3M/s

View exact numbers

Test name	Executions per second
✓ offsetWidth / offsetHeight	7,271,418 Ops/sec
clientWidth / clientHeight	6,426,961 Ops/sec
getBoundingClientRect	3,288,494 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:

clientWidth / clientHeight
const { clientWidth, clientHeight } = el; const perim = (clientWidth + clientHeight) * 2;
offsetWidth / offsetHeight
const { offsetWidth, offsetHeight } = el; const perim = (offsetWidth + offsetHeight) * 2;
getBoundingClientRect
const { width, height } = el.getBoundingClientRect(); const perim = (width + height) * 2;