JSFiddle - React, Tailwind, and code Playground

HTML

<a class='HeaderNewMessageIcon title='old title'></a>

JavaScript

var a = document.getElementsByClassName('HeaderNewMessageIcon')[0];
var oldTitle = a.title;
setInterval(function(){
    if(a.title !== oldTitle){
          alert("Title change");  
        oldTitle = a.title;
    }
},100);
    
    a.title = "title changed";