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_3_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.3.2

Device Platform: Mobile

Date tested: one year ago

getElementsByID

32.0M/s

getElementsByClassName

24.1M/s

querySelectorAll

7.9M/s

querySelector

4.5M/s

querySelector (ID)

3.0M/s

View exact numbers

Test name	Executions per second
✓ getElementsByID	31,964,154 Ops/sec
getElementsByClassName	24,139,134 Ops/sec
querySelectorAll	7,885,934 Ops/sec
querySelector	4,467,091 Ops/sec
querySelector (ID)	3,045,218 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")