Run results for: offsetWidth / offsetHeight vs. getBoundingClientRect()

Run details:

User agent: Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Safari/537.36 Chrome/86.0.4240.0

Browser: Chrome 86

Operating system: Windows XP

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
offsetWidth / offsetHeight (destructured and renamed)	102770.7 Ops/sec
offsetWidth / offsetHeight (destructured)	101145.8 Ops/sec
offsetWidth / offsetHeight (simple property access)	95032.5 Ops/sec
getBoundingClientRect() (destructured)	127956.6 Ops/sec
getBoundingClientRect() (simple property access)	117704.8 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:

offsetWidth / offsetHeight (destructured and renamed)
const { offsetWidth: width, offsetHeight: height } = el; const perim = (width + height) * 2;
offsetWidth / offsetHeight (destructured)
const { offsetWidth, offsetHeight } = el; const perim = (offsetWidth + offsetHeight) * 2;
offsetWidth / offsetHeight (simple property access)
const width = el.offsetWidth; const height = el.offsetHeight; 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;