Run results for: scrollHeight vs getBoundingClientRect().height

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.4 Safari/605.1.15

Browser: Safari 18

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

scrollHeight

12.3M/s

getBoundingClientRect().height

4.5M/s

View exact numbers

Test name	Executions per second
✓ scrollHeight	12,265,607 Ops/sec
getBoundingClientRect().height	4,470,082 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:

scrollHeight
const height = el.scrollHeight;
getBoundingClientRect().height
const height = el.getBoundingClientRect().height;