Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (X11; CrOS x86_64 11151.61.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36

Browser: Chrome 71

Operating system: Chrome OS 11151.61.0

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
getElementById	3517813.0 Ops/sec
querySelector	2050415.2 Ops/sec

HTML Preparation code:

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

AخA
 
<div id="testElement"></div>

Tests:

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