Benchmark: Selector performance - MeasureThat.net

HTML Preparation code:

<div id='h'>Hello</div>
<div class='w'>World</div>
<div class='w'>!</div>

Tests:

getElementById
document.getElementById('h');
querySelector
document.querySelector('#h');
getElementsByClassName
document.getElementsByClassName('w');
querySelectorAll
document.querySelectorAll('.w');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
getElementById
querySelector
getElementsByClassName
querySelectorAll

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36

Browser/OS: Chrome 75 on Linux

View result in a separate tab

Test name	Executions per second
getElementById	3023240.0 Ops/sec
querySelector	1792627.0 Ops/sec
getElementsByClassName	2974944.0 Ops/sec
querySelectorAll	882788.2 Ops/sec