JSFiddle - React, Tailwind, and code Playground

HTML

<input style="display: none;" id="Empty" value="x">
<input value="Copy Me If you want to.">
<input id="clipclear" type="button" value="Clear The Clipboard">

JavaScript

function clearclip(){
empty=document.getElementById("Empty");
empty.style.display="block";
empty.select();
        document.execCommand('copy');
empty.style.display="none";
}      
document.getElementById("clipclear").addEventListener("click", clearclip, false)
<!-- clearclip(); -->