Run results for: querySelector vs getElementsByClassName (get first element)

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.119 Safari/537.36

Browser: Chrome 72

Operating system: Mac OS X 10.13.6

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
querySelector	3518885.0 Ops/sec
getElementsByClassName (first element of)	3045962.0 Ops/sec
getElementById	4504834.0 Ops/sec

HTML Preparation code:

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

Tests:

querySelector
document.querySelector(".test")
getElementsByClassName (first element of)
document.getElementsByClassName(".test")[0]
getElementById
document.getElementById("test")