Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_4) AppleWebKit/604.3.5 (KHTML, like Gecko) Version/10.1 Safari/602.1 EdgiOS/45.5.0

Browser: Safari 10

Operating system: Mac OS X 10.12.4

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
getElementById	4153523.8 Ops/sec
querySelector	2631381.8 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;