Copy button does not work

[timothy-mckenna]

Thank you for this project!
RE js/text-obfuscator.js

function copyText() {
    var copyText = document.getElementById("output");
    copyText.select();
    copyText.setSelectionRange(0, 99999);
    document.execCommand("copy");
}

Would these references explain why copyText() is not successful?
https://stackoverflow.com/questions/45117731/javascript-execcommandcopy-not-working
https://stackoverflow.com/questions/74774213/how-to-add-clipboard-write-permission-to-navigator