JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <p>Try copying this text!</p>
</body>

JavaScript

window.addEventListener('copy', function (event) {
    // IE uses window.clipboardData.
    var clipboardData = event.clipboardData ? event.clipboardData : window.clipboardData;
    clipboardData.setData('text', 'Hello world!');
    event.preventDefault();
}, false);

window.addEventListener('paste', function (event) {
    var clipboardData = event.clipboardData ? event.clipboardData : window.clipboardData;
    alert("You tried to paste " + clipboardData.getData('text'));
    event.preventDefault();
}, false);