Run results for: querySelector vs getElementsByClassName

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 11_4_1 like Mac OS X) AppleWebKit/604.1.34 (KHTML, like Gecko) CriOS/67.0.3396.87 Mobile/15G77 Safari/604.1

Browser: Chrome Mobile iOS 67

Operating system: iOS 11.4.1

Device Platform: Mobile

Date tested: 5 years ago

Test name	Executions per second
querySelector	642110.9 Ops/sec
getElementsByClassName	1296554.0 Ops/sec

HTML Preparation code:

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

Tests:

querySelector
document.querySelector(".test")
getElementsByClassName
document.getElementsByClassName(".test")