Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0

Browser: Firefox 52

Operating system: Linux

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
getElementById	4781721.0 Ops/sec
querySelector	1805869.0 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;