JavaScript - Add/Append custom text on copy to clipboard

magic-copy.js

/**
 * Magic Copy
 * This little script will append some text to the clipboard when a user copies text from the website
 *
 * WARNING: This feature is an anti-pattern and a bad usability practice in 99% of cases, use only in
 *          those situations where it can really benefit the user to have a link to the full resource
 */
document.addEventListener('copy', (event) => {
    if (document.getSelection().toString().length < 10){ return; }
    const pagelink = `\n${document.location.href}`;
    event.clipboardData.setData('text', document.getSelection() + pagelink);
    event.preventDefault();
});