Run results for: DOM traversal

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36

Browser: Chrome 53

Operating system: Mac OS X 10.12.0

Device Platform: Other

Date tested: 8 years ago

Test name	Executions per second
querySelectorAll	127914.9 Ops/sec
getElementsByClassName	3309519.2 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