Run results for: querySelector vs querySelectorAll vs getElementsByClassName vs querySelector (ID) vs getElementsByID

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.129 Safari/537.36 OPR/68.0.3618.91

Browser: Opera 68

Operating system: Mac OS X 10.11.6

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
querySelector	1736453.0 Ops/sec
querySelectorAll	623637.9 Ops/sec
getElementsByClassName	2274176.0 Ops/sec
querySelector (ID)	1281827.0 Ops/sec
getElementsByID	1826157.0 Ops/sec

HTML Preparation code:

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

Tests:

querySelector
document.querySelector(".test")
querySelectorAll
document.querySelectorAll(".test")
getElementsByClassName
document.getElementsByClassName(".test")
querySelector (ID)
document.querySelector("#test")
getElementsByID
document.getElementById("test")