I migrated from CEF to WebView2 to render in-game overlays for better stability and performance. By default, you can't use WebView2 to render overlay using d3d11, but you can workaround this using https://gist.github.com/pabloko/5b5bfb71ac52d20dfad714c666a0c428

But here's a problem - when you click on the overlay html content, child window (Chrome_WidgetWin_0) will steal focus from main window, and all your keyboard input will be received by Chrome_WidgetWin_0 window, that means your main window WndProc won't be able to receive WM_KEYDOWN, WM_SYSKEYDOWN, etc while Chrome_WidgetWin_0 window have focus. To workaround this too, you can use my method below:

1. In browser creation code edit:

HRESULT __stdcall EdgeBrowser::Invoke(HRESULT errorCode, ICoreWebView2CompositionController *_comp) {
    if (FAILED(errorCode) || !GetWindow(mainWindow, GW_CHILD)) {
        return failFast();
    }

    if(onChildWindowCreated) //make your own callback
        onChildWindowCreated(GetWindow(mainWindow, GW_CHILD));

2. In your method where's browser is created:

Factory::createBrowser(..., [](HWND child) {
        executeOnMainThread([&]() {
            Overlay::originalWebView2ChildProc = (HRESULT (*)(HWND, UINT, WPARAM, LPARAM)) SetWindowLongPtrW(child, GWLP_WNDPROC, (LONG_PTR)Overlay::handleWebView2ChildProc);
        }).wait();
});

3. Define handleWebView2ChildProc function:

HRESULT(*originalWebView2ChildProc)(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) = nullptr;
HRESULT Overlay::handleWebView2ChildProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
    switch(message) {
        case WM_SYSKEYDOWN:
        case WM_KEYDOWN:
        case WM_INPUT:
        case WM_CHAR:
        case WM_SYSKEYUP:
        case WM_SYSCHAR:
        case WM_SYSCOMMAND:
        case WM_KEYUP: {
            Overlay::handleMessages(hwnd, message, wParam, lParam); //steal keyboard input from child window while it's focused and send to your message processing function to handle keys such open/close overlay, etc
            if(!isOverlayShown) //restore focus when overlay became not visible so handleWebView2ChildProc won't be called until you click on overlay content again
                SetFocus(MainWindow::windowHWND);
            return 0;
        }
        default:
            return originalWebView2ChildProc(hwnd, message, wParam, lParam);
    }
}

4. Done. You can also send keyboard input manually from your code to the browser using originalWebView2ChildProc.