Run results for: getElementsByClassName vs querySelectorAll

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.102 Safari/537.36 Vivaldi/1.97.1230.3

Browser: Chrome 67

Operating system: Windows 7

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
getElementsByClassName	190147.5 Ops/sec
querySelectorAll	1318.3 Ops/sec

HTML Preparation code:

<style>.searchMe {border: 1px sold red;}</style>
<table id="tableTest"></table>

Script Preparation code:

for(var i=0; i<10000; ++i)
{
  var cell = tableTest.insertRow(-1).insertCell(-1);
  if(i%2==0)
     cell.classList.add('searchMe');
}

Tests:

getElementsByClassName
var found = tableTest.getElementsByClassName('searchMe'); tableTest.rows[0].cells[0].textContent = found.length;
querySelectorAll
var found = tableTest.querySelectorAll('.searchMe'); tableTest.rows[0].cells[0].textContent = found.length;