JSFiddle - React, Tailwind, and code Playground
HTML
<a href="#firstHash">First</a> <br>
<a href="#secondHash">Second</a> <br>
<a href="#thirdHash">Third</a> <br>
<br>
<br>
<p id="current"></p>
JavaScript
var p = document.querySelector('#current');
window.addEventListener('hashchange', function(e){
p.innerHTML = window.location.hash;
})