Run results for: clientHeight vs offsetHeight vs window.getComputedStyle

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:138.0) Gecko/20100101 Firefox/138.0

Browser: Firefox 138

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

clientHeight

3.0M/s

offsetHeight

2.8M/s

window.getComputedStyle

2.3M/s

Multiple: _style e clientHeight

971K/s

Multiple: Only _style

897K/s

View exact numbers

Test name	Executions per second
✓ clientHeight	3,007,477 Ops/sec
offsetHeight	2,814,070 Ops/sec
window.getComputedStyle	2,254,767 Ops/sec
Multiple: _style e clientHeight	971,020 Ops/sec
Multiple: Only _style	896,675 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;