JSFiddle - React, Tailwind, and code Playground

HTML

<div id="q1">
      </div>
      <div id="q2">
      </div>
      <div id="q3">
      </div>
      <div id="q4">
      </div>
      <div id="q5">
      </div>

CSS

#q7{background-color:#eee; }

JavaScript

var element = document.getElementById('q4');
    element.setAttribute('id', 'q7');
    if(document.getElementById('q7').innerHTML = "All is well")
        alert(document.getElementById('q7').innerHTML);