Run results for: DOM traversal

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36

Browser: Chrome 54

Operating system: Windows

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
querySelectorAll	47679.9 Ops/sec
getElementsByClassName	1643655.2 Ops/sec

HTML Preparation code:

<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>
<p class="foo"></p>

Tests:

querySelectorAll
document.querySelectorAll('.foo')
getElementsByClassName
document.getElementsByClassName('foo')

Run results for: DOM traversal

Yeah!

querySelectorAll

getElementsByClassName