Benchmark: offsetHeight vs getClientBoundingRect().height

HTML Preparation code:

<div id="el">
  <h2>Lorem ipsum dolor sit amet</h2>
</div>

Script Preparation code:

var el = document.getElementById("el");

Tests:

offsetHeight
const height = el.offsetHeight; const perim = height * 2;
getBoundingCientRect
const rect = el.getBoundingClientRect(); const height = rect.height; const perim = height * 2;

Rendered benchmark preparation results:

Previous results

Test case name	Result
offsetHeight
getBoundingCientRect

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36

Browser/OS: Chrome 136 on Windows

offsetHeight

2.1M/s

getBoundingCientRect

1.2M/s

View exact numbers

Test name	Executions per second
✓ offsetHeight	2,115,258 Ops/sec
getBoundingCientRect	1,222,938 Ops/sec

offsetHeight vs getClientBoundingRect().height (version: 1)