Run results for: getElementById vs querySelector, with ten elements

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 120

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

getElementById

2.3M/s

querySelector

1.2M/s

View exact numbers

Test name	Executions per second
✓ getElementById	2,263,113 Ops/sec
querySelector	1,205,200 Ops/sec

HTML Preparation code:

<div id="testElement1"></div>
<div id="testElement2"></div>
<div id="testElement3"></div>
<div id="testElement4"></div>
<div id="testElement5"></div>
<div id="testElement6"></div>
<div id="testElement7"></div>
<div id="testElement8"></div>
<div id="testElement9"></div>
<div id="testElement10"></div>

Tests:

getElementById
var el = document.getElementById('testElement1'); var className = el.className;
querySelector
var el = document.querySelector('#testElement1'); var className = el.className;