Run results for: document.querySelector vs document.body.querySelector

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36

Browser: Chrome 90

Operating system: Mac OS X 10.14.6

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
querySelector	1901512.0 Ops/sec
querySelector.body	2702729.2 Ops/sec

HTML Preparation code:

<div id="testElement"></div>

Tests:

querySelector
var el = document.querySelector('#testElement'); var className = el.className;
querySelector.body
var el = document.body.querySelector('#testElement'); var className = el.className;