(function(window, document, undefined) { // code that should be taken care of right away window.onload = init; function init(){ const popup = document.getElementById("popup"); const help = document.getElementById("help"); function showPopup() { popup.style.display = "block"; console.log('cat') } function hidePopup() { popup.style.display = "none"; } help.addEventListener("click", showPopup); popup.addEventListener("click", hidePopup); } })(window, document, undefined);