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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser: Chrome 138

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

getBoundingClientRect() (simple property access)

1.9M/s

getBoundingClientRect() (destructured)

1.7M/s

offsetWidth / offsetHeight (simple property access)

1.3M/s

offsetWidth / offsetHeight (destructured)

1.1M/s

offsetWidth / offsetHeight (destructured and renamed)

1.1M/s

View exact numbers

Test name	Executions per second
✓ getBoundingClientRect() (simple property access)	1,865,233 Ops/sec
getBoundingClientRect() (destructured)	1,739,670 Ops/sec
offsetWidth / offsetHeight (simple property access)	1,288,425 Ops/sec
offsetWidth / offsetHeight (destructured)	1,086,433 Ops/sec
offsetWidth / offsetHeight (destructured and renamed)	1,057,665 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;