Run results for: querySelector vs getElementsByClassName[0] Perf

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:64.0) Gecko/20100101 Firefox/64.0

Browser: Firefox 64

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
QuerySelector	872843.6 Ops/sec
GetElementsByClassName[0]	831682.0 Ops/sec

HTML Preparation code:

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

Tests: