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

Run details:

User agent: Mozilla/5.0 (Linux; Android 13; 2201123G) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.6045.193 Mobile Safari/537.36 OPR/79.5.4195.76987

Browser: Opera Mobile 79

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

getElementsByClassName

2.5M/s

getElementsByID

2.0M/s

querySelector

2.0M/s

querySelector (ID)

1.5M/s

querySelectorAll

932K/s

View exact numbers

Test name	Executions per second
✓ getElementsByClassName	2,465,763 Ops/sec
getElementsByID	2,037,633 Ops/sec
querySelector	2,012,290 Ops/sec
querySelector (ID)	1,458,194 Ops/sec
querySelectorAll	931,680 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")