Run results for: clientWidth / clientHeight vs. getBoundingClientRect()

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/16.2 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 16

Operating system: iOS 16.2

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
clientWidth / clientHeight (destructured and renamed)	3007700.2 Ops/sec
clientWidth / clientHeight (destructured)	2537205.2 Ops/sec
clientWidth / clientHeight (simple property access)	1351360.2 Ops/sec
getBoundingClientRect() (destructured)	1835678.9 Ops/sec
getBoundingClientRect() (simple property access)	1898736.5 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;