Run results for: getElementById vs querySelector (multiple elements)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Goanna/4.8 Firefox/68.0 PaleMoon/29.0.1

Browser: Pale Moon (Firefox Variant) 29

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
getElementById	4677179.0 Ops/sec
querySelector	1439244.5 Ops/sec

HTML Preparation code:

<div id="testElement0"><div id="a2"></div></div>
<div id="testElement1"><div id="a3"></div></div>
<div id="testElement2"><div id="a4"></div></div>
<div id="testElement3"><div id="a5"></div></div>
<div id="testElement4"><div id="a7"></div></div>
<div id="testElement5"><div id="a9"></div></div>
<div id="testElement6"><div id="a8"></div></div>
<div id="testElement7"><div id="a6"></div></div>
<div id="testElement8"><div id="af"></div></div>
<div id="testElement9"><div id="as"></div></div>
<div id="testElement10"><div id="aa"><div id="b24242"></div></div></div>
<div id="testElement11"></div>
<div id="testElement12"></div>
<div id="testElement13"></div>
<div id="testElement14"></div>
<div id="testElement15"></div>
<div id="testElement16"></div>
<div id="testElement17"></div>

Tests:

getElementById
var el = document.getElementById('b24242'); var className = el.className;
querySelector
var el = document.querySelector('#b24242'); var className = el.className;