Run results for: cached getComputedStyle vs. getBoundingClientRect

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

getBoundingClientRect

522/s

getComputedStyle

306/s

View exact numbers

Test name	Executions per second
✓ getBoundingClientRect	522 Ops/sec
getComputedStyle	306 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; }