Run results for: querySelectorAll vs getElementsByTagName + (fixed/dynamic) length + for

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36

Browser: Chrome 142

Operating system: Windows

Device Platform: Desktop

Date tested: 3 months ago

Benchmark engine: Benchmark.js

Test name	Executions per second
✓ getElementsByTagName + length + for	3,149,687 Ops/sec
getElementsByTagName + dynamic length + for	1,005,993 Ops/sec
querySelectorAll + dynamic length + for	486,086 Ops/sec
querySelectorAll + length + for	359,251 Ops/sec
querySelectorAll + forEach	133,046 Ops/sec
getElementsByTagName + Array.from + forEach	97,733 Ops/sec

Test name

Executions per second

✓ getElementsByTagName + length + for

3,149,687 Ops/sec

getElementsByTagName + dynamic length + for

1,005,993 Ops/sec

querySelectorAll + dynamic length + for

486,086 Ops/sec

querySelectorAll + length + for

359,251 Ops/sec

querySelectorAll + forEach

133,046 Ops/sec

getElementsByTagName + Array.from + forEach

97,733 Ops/sec

Tests:

querySelectorAll + forEach
const allDivs = document.querySelectorAll('div'); allDivs.forEach(function (div) {});
getElementsByTagName + Array.from + forEach
const allDivs = document.getElementsByTagName('div'); const arrayAllDivs = Array.from(allDivs); arrayAllDivs.forEach(function (div) {});
querySelectorAll + length + for
const allDivs = document.querySelectorAll('div'); for (var i = 0, ilen = allDivs.length; i < ilen; i++) { /*NOOP*/ }
getElementsByTagName + length + for
const allDivs = document.getElementsByTagName('div'); for (var i = 0, ilen = allDivs.length; i < ilen; i++) { /*NOOP*/ }
querySelectorAll + dynamic length + for
const allDivs = document.querySelectorAll('div'); for (var i = 0; i < allDivs.length; i++) { /*NOOP*/ }
getElementsByTagName + dynamic length + for
const allDivs = document.getElementsByTagName('div'); for (var i = 0; i < allDivs.length; i++) { /*NOOP*/ }