Update

Kha/Backends/HTML5/kha/js/Microtask.hx

@@ -0,0 +1,28 @@
+package kha.js;
+
+import js.html.MessageChannel;
+
+class Microtask {
+	static var messageChannel: MessageChannel;
+	static final callbacks: Array<() -> Void> = [];
+
+	static function init(): Void {
+		if (messageChannel != null) {
+			return;
+		}
+		messageChannel = new MessageChannel();
+		messageChannel.port1.onmessage = _ -> {
+			final copy = callbacks.copy();
+			callbacks.resize(0);
+			for (callback in copy) {
+				callback();
+			}
+		};
+	}
+
+	public static function queueMicrotask(callback: () -> Void): Void {
+		init();
+		callbacks.push(callback);
+		messageChannel.port2.postMessage(js.Lib.undefined);
+	}
+}