Run results for: querySelector (NODE TO NODE) vs querySelectorAll

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Firefox/102.0

Browser: Firefox 102

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
querySelector from one node to next	4160186.8 Ops/sec
querySelectorAll	2699830.5 Ops/sec

HTML Preparation code:

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

Tests:

querySelector from one node to next
let node = document.querySelector('.test', element => { element.classList.add("read"); }); while(node) { node = node.querySelector('.test', element => { element.classList.add("read"); }); }
querySelectorAll
document.querySelectorAll(".test", elements => { elements.forEach(element => { element.classList.add("read") }) })

Run results for: querySelector (NODE TO NODE) vs querySelectorAll

querySelector from one node to next

querySelectorAll