changedetection.io/changedetectionio/static/js/global-settings.js

$(document).ready(function () {
    $("#api-key").hover(
        function () {
            $("#api-key-copy").html('copy').fadeIn();
        },
        function () {
            $("#api-key-copy").hide();
        }
    ).click(function (e) {
        $("#api-key-copy").html('copied');
        var range = document.createRange();
        var n = $("#api-key")[0];
        range.selectNode(n);
        window.getSelection().removeAllRanges();
        window.getSelection().addRange(range);
        document.execCommand("copy");
        window.getSelection().removeAllRanges();

    });

    $("#notification-token-toggle").click(function (e) {
        e.preventDefault();
        $('#notification-tokens-info').toggle();
    });
});