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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_7_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) FxiOS/134.0 Mobile/15E148 Safari/605.1.15

Browser: Mobile Safari 17

Operating system: iOS 17.7.2

Device Platform: Mobile

Date tested: one year ago

getElementsByID

23.3M/s

getElementsByClassName

18.7M/s

querySelectorAll

7.7M/s

querySelector

4.5M/s

querySelector (ID)

2.9M/s

View exact numbers

Test name	Executions per second
✓ getElementsByID	23,280,072 Ops/sec
getElementsByClassName	18,651,446 Ops/sec
querySelectorAll	7,657,384 Ops/sec
querySelector	4,473,984 Ops/sec
querySelector (ID)	2,875,761 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")