JSFiddle - React, Tailwind, and code Playground

HTML

<div id="alert" class="tooltip special" title="">
    <a href="https://"></a>
</div>

<div id="alert" class="tooltip normal" title="">
    <a href="https://"></a>
</div>

JavaScript

var elems = document.querySelectorAll("[id=alert]");

for (var i=0;i<elems.length;i++)
  {

    var elem = elems[i];
    if (elem.className=='tooltip special')
    {alert('special one');}
    else
    {alert('not special');}
  }