Run results for: DOM traversal

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/602.1.50 (KHTML, like Gecko) Version/10.0 Safari/602.1.50

Browser: Safari 10

Operating system: Mac OS X 10.11.6

Device Platform: Other

Date tested: 8 years ago

Test name	Executions per second
querySelectorAll	169156.0 Ops/sec
getElementsByClassName	5089105.0 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