Run results for: clientHeight vs offsetHeight vs window.getComputedStyle

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:132.0) Gecko/20100101 Firefox/132.0

Browser: Firefox 132

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

clientHeight

2.1M/s

offsetHeight

1.9M/s

window.getComputedStyle

1.5M/s

Multiple: _style e clientHeight

627K/s

Multiple: Only _style

610K/s

View exact numbers

Test name	Executions per second
✓ clientHeight	2,072,341 Ops/sec
offsetHeight	1,869,392 Ops/sec
window.getComputedStyle	1,509,475 Ops/sec
Multiple: _style e clientHeight	626,720 Ops/sec
Multiple: Only _style	609,854 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;