Defer loading of all render-blocking resources until the UI has loaded

public/scripts/util-main.js

@@ -0,0 +1,17 @@
+// Selector shortcuts
+const $ = query => document.getElementById(query);
+const $$ = query => document.querySelector(query);
+
+class Events {
+    static fire(type, detail = {}) {
+        window.dispatchEvent(new CustomEvent(type, { detail: detail }));
+    }
+
+    static on(type, callback, options) {
+        return window.addEventListener(type, callback, options);
+    }
+
+    static off(type, callback, options) {
+        return window.removeEventListener(type, callback, options);
+    }
+}