Run results for: getElementById vs querySelector vs querySelector for some other attribute vs querySelectorAll for some other attribute

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:72.0) Gecko/20100101 Firefox/72.0

Browser: Firefox 72

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
getElementById	1158450.9 Ops/sec
querySelector	928268.2 Ops/sec
querySelector for some other attribute	438956.4 Ops/sec
querySelectorAll for some other attribute	123816.5 Ops/sec

HTML Preparation code:

<div id="testElement" at="testElement"></div>

Tests:

getElementById
var el = document.getElementById('testElement'); var className = el.className;
querySelector
var el = document.querySelector('#testElement'); var className = el.className;
querySelector for some other attribute
var el = document.querySelector('[at="testElement"]'); var className = el.className;
querySelectorAll for some other attribute
var el = document.querySelectorAll('[at="testElement"]'); var className = el[0].className;