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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Firefox/102.0

Browser: Firefox 102

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
getBoundingClientRect	2771300.5 Ops/sec
window.getComputedStyle + new WebKitCSSMatrix	1106737.5 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;