Run results for: getBoundingClientRect vs offset performance

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.5 Safari/605.1.15

Browser: Safari 18

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

offset

6.5M/s

getBoundingClientRect

6.2M/s

View exact numbers

Test name	Executions per second
✓ offset	6,480,604 Ops/sec
getBoundingClientRect	6,191,380 Ops/sec

HTML Preparation code:

<div id="test" style="position: absolute; left: 10%; top: 20%;">Test</div>

Tests:

getBoundingClientRect
const testDiv = document.getElementById('test'); const testRect = testDiv.getBoundingClientRect(); const x = testRect.left + testRect.width / 2;
offset
const testDiv = document.getElementById('test'); const y = testDiv.offsetLeft + testDiv.offsetWidth / 2;