JSFiddle - React, Tailwind, and code Playground

HTML

<button onclick="dl()">
Down-load
</button>

JavaScript

function dl(){
  var a = document.createElement( "a" );
  var blob = new Blob([  new Uint8Array([104,101,108,108,111])  ]);
  var url = window.URL.createObjectURL( blob );
  a.href = url;  a.download = "hello.txt";
  document.body.appendChild(a);
  a.click();
  document.body.removeChild(a);
}