Run results for: getElementById vs querySelector data-id2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36

Browser: Chrome 85

Operating system: Mac OS X 10.15.6

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
getElementById	3616977.8 Ops/sec
querySelector	1675157.6 Ops/sec

HTML Preparation code:

<div id="testElement"></div>
<div data-id="testElement"></div>

AخA
 
<div id="testElement"></div>
<div data-id="testElement"></div>

Tests:

getElementById
var el = document.getElementById('testElement'); var className = el.className;
var el = document.getElementById('testElement');
var className = el.className;
querySelector
var el = document.querySelector('[data-id=testElement]'); var className = el.className;
var el = document.querySelector('[data-id=testElement]');
var className = el.className;