Run results for: getElementById vs querySelector (within container)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.61 Safari/537.36

Browser: Chrome 83

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
getElementById	3710565.8 Ops/sec
querySelector	4983294.5 Ops/sec

HTML Preparation code:

<div id="testElement0">
	<div id="testElement1">
      <div id="testElement2"></div>
    </div>
</div>

Script Preparation code:

var container = document.getElementById('testElement0');

Tests:

getElementById
var el = document.getElementById('testElement2'); var className = el.className;
querySelector
var el = container.querySelector('#testElement2'); var className = el.className;