Tools for awaiting ready -- still can't make focus() work

js/event.js

@@ -0,0 +1,15 @@
+export function waitForEvent(target, eventType) {
+    return new Promise((resolve) => {
+        function handler(event) {
+            target.removeEventListener(eventType, handler);
+            resolve(event);
+        }
+        target.addEventListener(eventType, handler);
+    });
+}
+export function waitForAnimationFrame() {
+    return new Promise((resolve) => {
+        requestAnimationFrame(resolve);
+    });
+}
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