diff --git a/src/plugins/platforms/wasm/qwasmcompositor.cpp b/src/plugins/platforms/wasm/qwasmcompositor.cpp
index 8cf0bf12af3..b1673908500 100644
--- a/src/plugins/platforms/wasm/qwasmcompositor.cpp
+++ b/src/plugins/platforms/wasm/qwasmcompositor.cpp
@@ -901,9 +901,10 @@ bool QWasmCompositor::processPointer(const PointerEvent& event)
     const QPoint targetPointInScreenCoords = screen()->geometry().topLeft() + event.point;
 
     QWindow *const targetWindow = ([this, &targetPointInScreenCoords]() -> QWindow * {
-        auto *targetWindow =
-            m_windowManipulation.operation() == WindowManipulation::Operation::None ?
-                screen()->compositor()->windowAt(targetPointInScreenCoords, 5) : nullptr;
+        auto *targetWindow = m_mouseCaptureWindow != nullptr ? m_mouseCaptureWindow.get()
+                : m_windowManipulation.operation() == WindowManipulation::Operation::None
+                ? screen()->compositor()->windowAt(targetPointInScreenCoords, 5)
+                : nullptr;
 
         return targetWindow ? targetWindow : m_lastMouseTargetWindow.get();
     })();
@@ -997,6 +998,8 @@ bool QWasmCompositor::processPointer(const PointerEvent& event)
 
 bool QWasmCompositor::deliverEventToTarget(const PointerEvent &event, QWindow *eventTarget)
 {
+    Q_ASSERT(!m_mouseCaptureWindow || m_mouseCaptureWindow.get() == eventTarget);
+
     const QPoint pointInScreenCoords = screen()->geometry().topLeft() + event.point;
     const QPoint targetPointClippedToScreen(
             std::max(screen()->geometry().left(),
@@ -1016,8 +1019,8 @@ bool QWasmCompositor::deliverEventToTarget(const PointerEvent &event, QWindow *e
     }
 
     WindowArea windowArea = WindowArea::Client;
-    if (!eventTarget->geometry().contains(targetPointClippedToScreen)
-        && !deliveringToPreviouslyClickedWindow) {
+    if (!deliveringToPreviouslyClickedWindow && !m_mouseCaptureWindow
+        && !eventTarget->geometry().contains(targetPointClippedToScreen)) {
         if (!eventTarget->frameGeometry().contains(targetPointClippedToScreen))
             return false;
         windowArea = WindowArea::NonClient;
@@ -1288,6 +1291,17 @@ int QWasmCompositor::handleTouch(int eventType, const EmscriptenTouchEvent *touc
     return static_cast<int>(accepted);
 }
 
+void QWasmCompositor::setCapture(QWasmWindow *window)
+{
+    Q_ASSERT(std::find(m_windowStack.begin(), m_windowStack.end(), window) != m_windowStack.end());
+    m_mouseCaptureWindow = window->window();
+}
+
+void QWasmCompositor::releaseCapture()
+{
+    m_mouseCaptureWindow = nullptr;
+}
+
 void QWasmCompositor::leaveWindow(QWindow *window)
 {
     m_windowUnderMouse = nullptr;
diff --git a/src/plugins/platforms/wasm/qwasmcompositor.h b/src/plugins/platforms/wasm/qwasmcompositor.h
index c883fc310df..8a6fd400d38 100644
--- a/src/plugins/platforms/wasm/qwasmcompositor.h
+++ b/src/plugins/platforms/wasm/qwasmcompositor.h
@@ -123,6 +123,8 @@ public:
     bool processKeyboard(int eventType, const EmscriptenKeyboardEvent *keyEvent);
     bool processWheel(int eventType, const EmscriptenWheelEvent *wheelEvent);
     int handleTouch(int eventType, const EmscriptenTouchEvent *touchEvent);
+    void setCapture(QWasmWindow *window);
+    void releaseCapture();
 
     bool processMouseEnter(const EmscriptenMouseEvent *mouseEvent);
     bool processMouseLeave();
@@ -218,6 +220,7 @@ private:
 
     QPointer<QWindow> m_pressedWindow;
     QPointer<QWindow> m_lastMouseTargetWindow;
+    QPointer<QWindow> m_mouseCaptureWindow;
 
     std::unique_ptr<qstdweb::EventCallback> m_pointerDownCallback;
     std::unique_ptr<qstdweb::EventCallback> m_pointerMoveCallback;
diff --git a/src/plugins/platforms/wasm/qwasmwindow.cpp b/src/plugins/platforms/wasm/qwasmwindow.cpp
index 16b4c6f53f6..ca58c52b2cb 100644
--- a/src/plugins/platforms/wasm/qwasmwindow.cpp
+++ b/src/plugins/platforms/wasm/qwasmwindow.cpp
@@ -438,4 +438,13 @@ void QWasmWindow::requestActivateWindow()
     QPlatformWindow::requestActivateWindow();
 }
 
+bool QWasmWindow::setMouseGrabEnabled(bool grab)
+{
+    if (grab)
+        m_compositor->setCapture(this);
+    else
+        m_compositor->releaseCapture();
+    return true;
+}
+
 QT_END_NAMESPACE
diff --git a/src/plugins/platforms/wasm/qwasmwindow.h b/src/plugins/platforms/wasm/qwasmwindow.h
index 6503c4a5c68..f1fc5e061c5 100644
--- a/src/plugins/platforms/wasm/qwasmwindow.h
+++ b/src/plugins/platforms/wasm/qwasmwindow.h
@@ -65,7 +65,7 @@ public:
     void setWindowState(Qt::WindowStates state) override;
     void applyWindowState();
     bool setKeyboardGrabEnabled(bool) override { return false; }
-    bool setMouseGrabEnabled(bool) override { return false; }
+    bool setMouseGrabEnabled(bool grab) final;
 
 protected:
     void invalidate();