MeasureThat.net

Run results for: Test performance of different ways of get just one particular DOM element

getElementById vs getElementsByTagName vs querySelector vs getElementsByClassName vs getElementsByName

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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
getElementsByTagName 1193788.9 Ops/sec
querySelector 1406784.0 Ops/sec
getElementsByClassName 1209756.8 Ops/sec
getElementsByName 1387566.6 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:

  • 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;