MeasureThat.net

Run results for: getElementById vs querySelector vs getElementsByClassName

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/70.0.3538.110 Safari/537.36
Chrome 70
Windows
Desktop
6 years ago
Test name Executions per second
getElementById 2715493.2 Ops/sec
getElementsByTagName 1150559.8 Ops/sec
querySelector 1426911.9 Ops/sec
getElementsByClassName 1159674.9 Ops/sec
getElementsByName 1321494.1 Ops/sec
HTML Preparation code:
AخA
 
1
<div id="testdiv06">
2
  <div id="unique06" class="unique" name="unique" data-unique="1">test</div>
3
</div>
4
<div id="testdiv05">
5
  <div id="unique05" class="unique" name="unique" data-unique="1">test</div>
6
</div>
7
<div id="testdiv04">
8
  <div id="unique04" class="unique" name="unique" data-unique="1">test</div>
9
</div>
10
<div id="testdiv03">
11
  <div id="unique03" class="unique" name="unique" data-unique="1">test</div>
12
</div>
13
<div id="testdiv02">
14
  <div id="unique02" class="unique" name="unique" data-unique="1">test</div>
15
</div>
16
<div id="testdiv01">
17
  <div id="unique01" class="unique" name="unique" data-unique="1">test</div>
18
</div>
19
<div id="testdiv">
20
  <div id="unique" class="unique" name="unique" data-unique="1">test</div>
21
</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;