JSFiddle - React, Tailwind, and code Playground

HTML

<iframe id="frame" style="width: 500px; height: 500px;" src="https://www.behance.net/"></iframe><br />
<input type="button" id="toggle" value="Toggle" />

JavaScript

var frame = document.getElementById('frame');

document.getElementById('toggle').onclick = function() {
    var newVis = frame.style.visibility == 'hidden' ? 'visible' : 'hidden';
    
    frame.style.visibility = newVis;
};