JSFiddle - React, Tailwind, and code Playground

HTML

<span class="mine">a</span>
<span class="mine">a</span>
<span class="mine">a</span>

JavaScript

var elements = document.getElementsByClassName("mine");
var aLength = elements.length;

console.log(elements, aLength);

for(var a = 0; a < aLength; a++){
   console.log(a);
}