Run results for: querySelector vs getElementsById

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36

Browser: Chrome 79

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
querySelector	2804089.0 Ops/sec
getElementsByClassName	5070855.0 Ops/sec

HTML Preparation code:

<div id="test"></div>

AخA
 
<div id="test"></div>

Tests:

querySelector
document.querySelector("#test")
document.querySelector("#test")
getElementsByClassName
document.getElementById("test")
document.getElementById("test")