Run results for: clientHeight vs offsetHeight vs window.getComputedStyle

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:130.0) Gecko/20100101 Firefox/130.0

Browser: Firefox 130

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

clientHeight

7.1M/s

offsetHeight

6.3M/s

window.getComputedStyle

6.3M/s

Multiple: _style e clientHeight

2.5M/s

Multiple: Only _style

2.4M/s

View exact numbers

Test name	Executions per second
✓ clientHeight	7,065,394 Ops/sec
offsetHeight	6,314,260 Ops/sec
window.getComputedStyle	6,251,313 Ops/sec
Multiple: _style e clientHeight	2,497,633 Ops/sec
Multiple: Only _style	2,433,755 Ops/sec

HTML Preparation code:

<div id="teste">teste</div>

Script Preparation code:

var teste_n = '123px';
var _style = window.getComputedStyle(document.getElementById('teste'));

Tests:

clientHeight
document.getElementById('teste').clientHeight;
offsetHeight
document.getElementById('teste').offsetHeight;
window.getComputedStyle
parseFloat(_style['height'])
Multiple: Only _style
parseFloat(_style['margin-top']) parseFloat(_style['margin-bottom']) parseFloat(_style['height'])
Multiple: _style e clientHeight
parseFloat(_style['margin-top']) parseFloat(_style['margin-bottom']) document.getElementById('teste').clientHeight;