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

Run details:

User agent: Mozilla/5.0 (Android 13; Mobile; rv:109.0) Gecko/114.0 Firefox/114.0

Browser: Firefox Mobile 114

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
clientWidth / clientHeight (destructured and renamed)	5796316.5 Ops/sec
clientWidth / clientHeight (destructured)	5759618.5 Ops/sec
clientWidth / clientHeight (simple property access)	5701253.5 Ops/sec
getBoundingClientRect() (destructured)	1854468.0 Ops/sec
getBoundingClientRect() (simple property access)	1457819.6 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;