Run results for: className vs classList

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:48.0) Gecko/20100101 Firefox/48.0

Browser: Firefox 48

Operating system: Ubuntu

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
className	501.6 Ops/sec
classList	7386.8 Ops/sec

HTML Preparation code:

<style>
  .redText
  {
    color: red;
  }
  
  .redBorder
  {
    border: 1px solid red;
  }
</style>

<div id="testDiv">Sample div</div>

Tests:

className
var div = document.getElementById('testDiv'); div.className += 'redText'; div.className += 'redBorder';
classList
var div = document.getElementById('testDiv'); div.classList.add('redText'); div.classList.add('redBorder');