JSFiddle - React, Tailwind, and code Playground

HTML

<a onclick="swapPhoto()" href="#">test</a>
<div id="test123"></div>

JavaScript

function swapPhoto() {
  var req = new XMLHttpRequest();

req.open('GET', './', false);    
req.send();
  if (req.status == 200) {
      var tmp = document.getElementById("test123");
tmp.innerHTML = req.responseText;   
    return true;
  }
  return false;
}