Run results for: querySelector(nth-of-child) vs querySelectorAll and index array

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:135.0) Gecko/20100101 Firefox/135.0

Browser: Firefox 135

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

document.querySelector(nth)

2.6M/s

document.querySelectorAll

1.7M/s

View exact numbers

Test name	Executions per second
✓ document.querySelector(nth)	2,552,174 Ops/sec
document.querySelectorAll	1,726,457 Ops/sec

HTML Preparation code:

<div id="base">
  <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>
</div>

Tests:

document.querySelector(nth)
document.querySelector("div#base > div:nth-of-type(5)")
document.querySelectorAll
document.querySelectorAll('div#base > div.test')[4]