Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (iPad; CPU OS 10_2 like Mac OS X) AppleWebKit/602.3.12 (KHTML, like Gecko) Version/10.0 Mobile/14C92 Safari/602.1

Browser: Mobile Safari 10

Operating system: iOS 10.2

Device Platform: Tablet

Date tested: 5 years ago

Test name	Executions per second
getElementById	1229536.0 Ops/sec
querySelector	968945.6 Ops/sec

HTML Preparation code:

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

Tests:

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