copyright clipboard select copy

copyright.js

// Source: https://www.thepunctuationguide.com/js/copyright.js
function addLink() {

    var selection = window.getSelection(),
        pagelink = '<br /><br /> From ' + document.location.href + '<br />© 2020 thepunctuationguide.com',
        copytext = selection + pagelink,
        newdiv = document.createElement('div');


    newdiv.style.position = 'absolute';
    newdiv.style.left = '-99999px';


    document.body.appendChild(newdiv);
    newdiv.innerHTML = copytext;
    selection.selectAllChildren(newdiv);

    window.setTimeout(function () {
        document.body.removeChild(newdiv);
    }, 100);
}

document.addEventListener('copy', addLink);