site/_includes/scripts/close.js

// unnick asked for this, i provide.
// this provides no usefulness and there is no implementation to respawn windows. but i think it's funny and you can just reload
document.addEventListener("DOMContentLoaded", function() {
    document.querySelectorAll("close-button").forEach(e => {
        e.onclick = () => e.parentElement.parentElement.parentElement.remove();
    });
});