Fix "onload" events to support multiple

articles/static/edit-keymap.js

@@ -1,13 +1,22 @@
 'use strict';
-window.onload = function () {
+
+function bindKey() {
     const adminLinkElement = document.querySelector("a#admin-link");
     if (adminLinkElement === undefined || adminLinkElement === null) {
         return;
     }
     const adminLocation = adminLinkElement.href;
-    document.addEventListener("keydown", function(event) {
+    document.addEventListener("keydown", function (event) {
         if (event.code === "KeyE") {
             window.location = adminLocation;
         }
     })
 }
+
+((readyState) => {
+    if (readyState === "interactive") {
+        bindKey();
+    } else if (readyState === "loading") {
+        window.addEventListener("DOMContentLoaded", bindKey, false);
+    }
+})(document.readyState);

articles/static/live-preview.js

@@ -1,11 +1,19 @@
 let preview = null;
 
-window.onload = function () {
+function onLoad () {
     const previewButton = document.querySelector("input#_live_preview");
     if (previewButton) {
         previewButton.addEventListener("click", openPreviewPopup);
     }
-};
+}
+((readyState) => {
+    if (readyState === "interactive") {
+        onLoad();
+    } else if (readyState === "loading") {
+        window.addEventListener("DOMContentLoaded", onLoad, false);
+    }
+})(document.readyState);
+
 window.onbeforeunload = function () {
     if (preview !== null) {
         preview.close();