Run results for: Query Selector v Sizzle

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:122.0) Gecko/20100101 Firefox/122.0

Browser: Firefox 122

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

sizzle ID

8.9M/s

qs ID

5.3M/s

sizzle Class

2.4M/s

qs Class

2.4M/s

View exact numbers

Test name	Executions per second
✓ sizzle ID	8,877,340 Ops/sec
qs ID	5,299,816 Ops/sec
sizzle Class	2,408,327 Ops/sec
qs Class	2,351,663 Ops/sec

HTML Preparation code:

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>

<div id="test" class="m">a</div>
<div class="m">b</div>

Script Preparation code:

var select = function(selector) {
	if (!selector) return null
	
	if (selector.charAt(0) == '#') {
		return document.querySelector(selector)
	} else {
		var result = document.querySelectorAll(selector)
		switch (result.length) {
			case 0:
				return null
			case 1:
				return result[0]
			default:
				return result
		}
	}
}

Tests:

qs ID
select('#test')
qs Class
select('.m')
sizzle ID
$('#test')
sizzle Class
$('.m')