JSFiddle - React, Tailwind, and code Playground

HTML

<select>
    <option>aaa</option>
    <option>bbb</option>
    <option>abvvaa</option>
</select>

JavaScript

window.addEventListener('keydown', function(e) {
    debugger
  var key = e.keyCode || e.which;
  if (key == 8 /*BACKSPACE*/ || key == 46/*DELETE*/) {
    var len=window.location.href.length;
    if(window.location.href[len-1]!='#') window.location.href += "#";
  }
},false);