Run results for: clientHeight vs offsetHeight vs window.getComputedStyle

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/87.0.4280.77 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 87

Operating system: iOS 14.2

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
clientHeight	2725990.0 Ops/sec
offsetHeight	2802977.0 Ops/sec
window.getComputedStyle	1652097.0 Ops/sec
Multiple: Only _style	676941.9 Ops/sec
Multiple: _style e clientHeight	777691.8 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;

Run results for: clientHeight vs offsetHeight vs window.getComputedStyle

clientHeight

offsetHeight

window.getComputedStyle

Multiple: Only _style

Multiple: _style e clientHeight