MeasureThat.net

Run results for: getElementById vs querySelector vs getElementsByClassName vs getElementsByName

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

Go to the benchmark
Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.107 Safari/537.36
Chrome 92
Windows
Desktop
3 years ago
Test name Executions per second
getElementById 5110255.5 Ops/sec
getElementsByTagName 2353573.5 Ops/sec
querySelector 3115700.0 Ops/sec
getElementsByClassName 2815489.0 Ops/sec
getElementsByName 3213050.0 Ops/sec
HTML Preparation code:
AخA
 
1
<div id="testdiv">
2
  <div id="unique" class="unique" name="unique" data-unique="1">test</div>
3
</div>
Script Preparation code:
 
var i, imax;
var doc = document;
Tests:

  • getElementById

     
    var test = doc.getElementById('testdiv').childNodes[0].innerHTML;

  • getElementsByTagName

     
    var formelem = doc.getElementById('testdiv').getElementsByTagName('div')[0].innerHTML;

  • querySelector

     
    var test = doc.getElementById('testdiv').querySelector('.unique').innerHTML;

  • getElementsByClassName

     
    var test = doc.getElementById('testdiv').getElementsByClassName('unique')[0].innerHTML;

  • getElementsByName

     
    var test = doc.getElementsByName('unique')[0].innerHTML;