diff --git a/src/corelib/kernel/qeventdispatcher_wasm.cpp b/src/corelib/kernel/qeventdispatcher_wasm.cpp
index f4fcdbb8b29..4aa435b64b0 100644
--- a/src/corelib/kernel/qeventdispatcher_wasm.cpp
+++ b/src/corelib/kernel/qeventdispatcher_wasm.cpp
@@ -938,10 +938,11 @@ void QEventDispatcherWasm::callOnLoadedIfRequired()
 
 void QEventDispatcherWasm::onLoaded()
 {
-    emscripten::val qt = emscripten::val::module_property("qt");
-    if (qt.isUndefined())
-        return;
-    qt.call<void>("onLoaded");
+    // TODO: call qtloader.js onLoaded from here, in order to delay
+    // hiding the "Loading..." message until the app is ready to paint
+    // the first frame. Currently onLoaded must be called early before
+    // main() in order to ensure that the screen/container elements
+    // have valid geometry at startup.
 }
 
 namespace {
diff --git a/src/plugins/platforms/wasm/qtloader.js b/src/plugins/platforms/wasm/qtloader.js
index bbc0ac68ab0..8027dd8fa9f 100644
--- a/src/plugins/platforms/wasm/qtloader.js
+++ b/src/plugins/platforms/wasm/qtloader.js
@@ -23,7 +23,8 @@
  * - fontDpi: number
  *      Specifies font DPI for the instance
  * - onLoaded: () => void
- *      Called when the module has loaded.
+ *      Called when the module has loaded, at the point in time where any loading placeholder
+ *      should be hidden and the application window should be shown.
  * - entryFunction: (emscriptenConfig: object) => Promise<EmscriptenModule>
  *      Qt always uses emscripten's MODULARIZE option. This is the MODULARIZE entry function.
  * - module: Promise<WebAssembly.Module>
@@ -172,9 +173,14 @@ async function qtLoad(config)
         config.preRun = [];
     config.preRun.push(qtPreRun);
 
+    const originalOnRuntimeInitialized = config.onRuntimeInitialized;
+    config.onRuntimeInitialized = () => {
+        originalOnRuntimeInitialized?.();
+        config.qt.onLoaded?.();
+    }
+
     const originalLocateFile = config.locateFile;
-    config.locateFile = filename =>
-    {
+    config.locateFile = filename => {
         const originalLocatedFilename = originalLocateFile ? originalLocateFile(filename) : filename;
         if (originalLocatedFilename.startsWith('libQt6'))
             return `${config.qt.qtdir}/lib/${originalLocatedFilename}`;