Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Linux; U; Android 9; en-us; Redmi Note 5 Build/PKQ1.180904.001) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/71.0.3578.141 Mobile Safari/537.36 XiaoMi/MiuiBrowser/10.9.7-g

Browser: Chrome Mobile 71

Operating system: Android

Device Platform: Mobile

Date tested: 4 years ago

Test name	Executions per second
getElementById	1020354.0 Ops/sec
querySelector	495314.9 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;