Run results for: Get precise height : getComputedStyle vs getBoundingClientRect vs innerHeight

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_7_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/134.0.6998.99 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 134

Operating system: iOS 17.7.1

Device Platform: Mobile

Date tested: one month ago

Test name	Executions per second
getComputedStyle	884.2 Ops/sec
getBoundingClientRect	898.3 Ops/sec
clientHeight	3453.2 Ops/sec

HTML Preparation code:

<div id="foo"></div>

Tests:

getComputedStyle
var i = 5000; while (i--) { checkDisplay('foo'); } function checkDisplay(id) { return window.getComputedStyle(document.getElementById(id), null).getPropertyValue("height").slice(0, -2); }
getBoundingClientRect
var i = 5000; while (i--) { checkDisplay('foo'); } function checkDisplay(id) { return document.getElementById(id).getBoundingClientRect().height; }
clientHeight
var i = 5000; while (i--) { checkDisplay('foo'); } function checkDisplay(id) { return document.getElementById(id).clientHeight; }

Run results for: Get precise height : getComputedStyle vs getBoundingClientRect vs innerHeight

getComputedStyle

getBoundingClientRect

clientHeight