Run results for: querySelector vs getElementsByClassName

Run details:

User agent: Mozilla/5.0 (Windows NT 5.1; rv:52.0) Gecko/20100101 Firefox/52.0

Browser: Firefox 52

Operating system: Windows XP

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
querySelector	1319922.0 Ops/sec
getElementsByClassName	12781190.0 Ops/sec

HTML Preparation code:

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

Tests: