JSFiddle - React, Tailwind, and code Playground

HTML

<p>
This is the copied text!
</p>
<input type="hidden" class="copied"/>
<button>
COPY
</button>
<input type="text" placeholder="paste copied text here"/>

JavaScript

$("button").on("click", function() {
  var n = $("p").text();
  n = $.trim(n);
  $(".copied").attr("value", n).select();
  document.execCommand("copy");
});