Run results for: getElementById vs querySelector ID vs getElementsByClassName vs querySelectorAll

Run details:

User agent: Mozilla/5.0 (Linux; Android 8.0.0; RNE-L22) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.83 Mobile Safari/537.36

Browser: Chrome Mobile 83

Operating system: Android 8.0.0

Device Platform: Mobile

Date tested: 3 years ago

HTML Preparation code:

<div id="test_element_id" class="test_element_class"></div>

Tests:

getElementById
var el = document.getElementById('test_element_id'); var className = el.className;
querySelector
var el = document.querySelector('#test_element_id'); var className = el.className;
getElementsByClassName
var el = document.getElementsByClassName('test_element_class')[0]; var className = el.className;
querySelectorAll
var el = document.querySelectorAll('.test_element_class')[0]; var className = el.className;
querySelector class
var el = document.querySelector('.test_element_class'); var className = el.className;