JSFiddle - React, Tailwind, and code Playground

HTML

<span>Copy this text and try to paste it in the input.</span>
<br />
<input></input>

JavaScript

window.globalCopyObject = {};
    window.globalCopyObject.clipboardDataText = "text value";
    window.globalCopyObject.clipboardHtmlText = "html value";

document.addEventListener("copy", function (event) {
        document.designMode = "on";
        event.clipboardData.setData("text/plain", window.globalCopyObject.clipboardDataText);
        event.clipboardData.setData("text/html", window.globalCopyObject.clipboardHtmlText);
        event.preventDefault();        
    });