Run results for: clientWidth / clientHeight 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

clientWidth / clientHeight (destructured and renamed)

8.4M/s

clientWidth / clientHeight (destructured)

8.2M/s

clientWidth / clientHeight (simple property access)

6.6M/s

getBoundingClientRect() (destructured)

4.2M/s

getBoundingClientRect() (simple property access)

2.6M/s

View exact numbers

Test name	Executions per second
✓ clientWidth / clientHeight (destructured and renamed)	8,424,542 Ops/sec
clientWidth / clientHeight (destructured)	8,197,593 Ops/sec
clientWidth / clientHeight (simple property access)	6,626,946 Ops/sec
getBoundingClientRect() (destructured)	4,164,584 Ops/sec
getBoundingClientRect() (simple property access)	2,631,306 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 (destructured and renamed)
const { clientWidth: width, clientHeight: height } = el; const perim = (width + height) * 2;
clientWidth / clientHeight (destructured)
const { clientWidth, clientHeight } = el; const perim = (clientWidth + clientHeight) * 2;
clientWidth / clientHeight (simple property access)
const width = el.clientWidth; const height = el.clientHeight; const perim = (width + height) * 2;
getBoundingClientRect() (destructured)
const { width, height } = el.getBoundingClientRect(); const perim = (width + height) * 2;
getBoundingClientRect() (simple property access)
const rect = el.getBoundingClientRect(); const width = rect.width; const height = rect.height; const perim = (width + height) * 2;