Run results for: querySelector vs getElementsByClassName

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0

Browser: Firefox 63

Operating system: Linux

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
querySelector	2111665.0 Ops/sec
getElementsByClassName	3981255.0 Ops/sec

HTML Preparation code:

<div class="test"></div>

Tests: