JSFiddle - React, Tailwind, and code Playground

HTML

<button id="btn">go fullscreen</button>
    <div id="docEl">Hello</div>

CSS

html{color: gray;}

JavaScript

btn.onclick = e => {
      var requestFullScreen = docEl.requestFullscreen || docEl.mozRequestFullScreen || docEl.webkitRequestFullscreen || docEl.msRequestFullscreen;
      requestFullScreen.call(docEl);
    }