Run results for: querySelector vs getElementsByClassName with destructuring assignment vs getElementsByClassName get first element

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

querySelector

26.7M/s

getElementsByClassName get first element

21.3M/s

getElementsByClassName with destructuring assignment

15.5M/s

View exact numbers

Test name	Executions per second
✓ querySelector	26,744,934 Ops/sec
getElementsByClassName get first element	21,259,350 Ops/sec
getElementsByClassName with destructuring assignment	15,505,136 Ops/sec

HTML Preparation code:

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

Tests:

querySelector
/*When writing async/deferred tests, use `deferred.resolve()` to mark test as done*/ const testElement = document.querySelector(".test");
getElementsByClassName with destructuring assignment
const [testElement] = document.getElementsByClassName(".test");
getElementsByClassName get first element
const testElement = document.getElementsByClassName(".test")[0];