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

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.0 YaBrowser/24.12.2.460.10 SA/3 Mobile/15E148 Safari/604.1

Browser: Yandex Browser 24

Operating system: iOS 18.2

Device Platform: Mobile

Date tested: one year ago

getElementsByID

72.3M/s

getElementsByClassName

60.2M/s

querySelectorAll

21.8M/s

querySelector

13.3M/s

querySelector (ID)

9.1M/s

View exact numbers

Test name	Executions per second
✓ getElementsByID	72,264,520 Ops/sec
getElementsByClassName	60,180,144 Ops/sec
querySelectorAll	21,786,272 Ops/sec
querySelector	13,263,445 Ops/sec
querySelector (ID)	9,074,280 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")