Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 10_0_2 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) FxiOS/5.3 Mobile/14A456 Safari/602.1.50

Browser: Mobile Safari 10

Operating system: iOS 10.0.2

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
getElementById	1339680.9 Ops/sec
querySelector	731916.1 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;