Run results for: clientHeight vs offsetHeight vs window.getComputedStyle

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0

Browser: Firefox 133

Operating system: Ubuntu

Device Platform: Desktop

Date tested: one year ago

clientHeight

1.5M/s

offsetHeight

1.3M/s

window.getComputedStyle

1.1M/s

Multiple: _style e clientHeight

457K/s

Multiple: Only _style

449K/s

View exact numbers

Test name	Executions per second
✓ clientHeight	1,491,391 Ops/sec
offsetHeight	1,304,397 Ops/sec
window.getComputedStyle	1,092,404 Ops/sec
Multiple: _style e clientHeight	456,816 Ops/sec
Multiple: Only _style	448,659 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;