Run results for: cached getComputedStyle vs. getBoundingClientRect

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:122.0) Gecko/20100101 Firefox/122.0

Browser: Firefox 122

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
getComputedStyle	543.2 Ops/sec
getBoundingClientRect	353.8 Ops/sec

HTML Preparation code:

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

Tests:

getComputedStyle
const elem = document.getElementById("foo"); const computed = getComputedStyle(elem); var i = 5000; while (i--) { getHeight(); } function getHeight() { return parseFloat(computed.height); }
getBoundingClientRect
const elem = document.getElementById("foo"); var i = 5000; while (i--) { getHeight(); } function getHeight() { return elem.getBoundingClientRect().height; }