Run results for: getElementById vs querySelector vs getElementsByClassName vs getElementsByName 2

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.141 Safari/537.36

Browser: Chrome 87

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
getElementById	4460380.0 Ops/sec
getElementsByClassName	3176354.5 Ops/sec
getElementsByName	3291088.8 Ops/sec
querySelectorAll	799923.3 Ops/sec

HTML Preparation code:

<div id="testdiv1">
  <div id="testdiv2" class="unique2" name="unique2" data-unique="2">test</div>
  <div id="testdiv3" class="unique3" name="unique3" data-unique="3">test</div>
</div>

Script Preparation code:

var i, imax;
var doc = document;

Tests:

getElementById
var test = doc.getElementById('testdiv2').innerHTML;
getElementsByClassName
var test = doc.getElementsByClassName('unique2')[0].innerHTML;
getElementsByName
var test = doc.getElementsByName('unique2')[0].innerHTML;
querySelectorAll
var test = doc.querySelectorAll("[data-unique='2']")

Run results for: getElementById vs querySelector vs getElementsByClassName vs getElementsByName 2

Test performance of different ways of get just one particular DOM element

getElementById

getElementsByClassName

getElementsByName

querySelectorAll