Add a special message when users copy text

The original text

Copied from https://www.yourwebsite.com

<div id="content">
    ...
</div>

const contentEle = document.getElementById('content');

contentEle.addEventListener('copy', (e) => {
    // We will add a custom message here ...
});

element.addEventListener('copy', (e) => {
    const clipboardData = e.clipboardData;
    const originalText = window.getSelection().toString();
    if (!originalText) {
        return;
    }

    // Modify the clipboard data
    e.preventDefault();
    clipboardData.setData('text/plain', originalText + '\n\n' + 'Copied from https://yourwebsite.com');
});

e.preventDefault();