Run results for: getElementById vs querySelector

Run details:

User agent: Mozilla/5.0 (Linux; U; Android 8.1.0; es-us; Redmi 6 Build/O11019) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/61.0.3163.128 Mobile Safari/537.36 XiaoMi/MiuiBrowser/10.2.5-g

Browser: Chrome Mobile 61

Operating system: Android 8.1.0

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
getElementById	444983.2 Ops/sec
querySelector	283220.8 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;