Run results for: querySelector vs getElementsByClassName

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:66.0) Gecko/20100101 Firefox/66.0

Browser: Firefox 66

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
querySelector	2976473.0 Ops/sec
getElementsByClassName	4447161.0 Ops/sec

HTML Preparation code:

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

Tests: