Run results for: getBoundingClientRect vs window.getComputedStyle + new WebKitCSSMatrix

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:151.0) Gecko/20100101 Firefox/151.0

Browser: Firefox 151

Operating system: Linux

Device Platform: Desktop

Date tested: 3 months ago

Benchmark engine: Benchmark.js

getBoundingClientRect

1.4M/s

window.getComputedStyle + new WebKitCSSMatrix

345K/s

View exact numbers

Test name	Executions per second
✓ getBoundingClientRect	1,396,610 Ops/sec
window.getComputedStyle + new WebKitCSSMatrix	344,835 Ops/sec

HTML Preparation code:

<div id="test"></div>

Tests:

getBoundingClientRect
let element = document.getElementById('test'); let rect = element.getBoundingClientRect(); let left = rect.left;
window.getComputedStyle + new WebKitCSSMatrix
let element = document.getElementById('test'); let style = window.getComputedStyle(element); let matrix = new WebKitCSSMatrix(style.transform); let left = matrix.m41;