I’m writing a cross-platform application and I’ve done the page navigation logic. It works for phones and computers and for Windows and Android emulator everything works, but for browser version it doesn’t. It just defaults to “Powered by Avalonia”.
I don’t know how to fix it

here is the code for page navigation

using Avalonia.Controls;

namespace QuizApplication.Services
{
    public interface INavigationService
    {
        void Register<TViewModel, TView>() where TViewModel : class where TView : Control;
        void NavigateTo<TViewModel>(TViewModel viewModel) where TViewModel : class;
    }
}

using Avalonia.Controls;
using QuizApplication.Views;
using System;
using System.Collections.Generic;

namespace QuizApplication.Services;

public class NavigationService : INavigationService
{
    private readonly Window? _mainWindow;
    private readonly MainView? _mainView;
    private readonly Dictionary<Type, Type> _registrations;

    public NavigationService(Window mainWindow)
    {
        _mainWindow = mainWindow;
        _registrations = new Dictionary<Type, Type>();
    }

    public NavigationService(MainView mainView)
    {
        _mainView = mainView;
        _registrations = new Dictionary<Type, Type>();
    }

    public void Register<TViewModel, TView>() where TViewModel : class where TView : Control
    {
        _registrations[typeof(TViewModel)] = typeof(TView);
    }

    public void NavigateTo<TViewModel>(TViewModel viewModel) where TViewModel : class
    {
        if (_registrations.TryGetValue(typeof(TViewModel), out var viewType))
        {
            var view = (Control)Activator.CreateInstance(viewType)!;
            view.DataContext = viewModel;

            if (_mainWindow != null)
            {
                _mainWindow.Content = view;
            }
            else if (_mainView != null)
            {
                _mainView.Content = view;
            }
            else
            {
                throw new Exception("No valid main view available for navigation");
            }
        }
        else
        {
            throw new Exception($"View model {typeof(TViewModel)} is not registered");
        }
    }
}

using QuizApplication.Services;
using QuizApplication.ViewModels.MainPagesViewModels;
using QuizApplication.Views.MainPagesViews;

namespace QuizApplication.ApplicationSetup
{
    public static class PagesRegistration
    {
        public static void RegisterPagesMapping(INavigationService navigationService)
        {
            navigationService.Register<MainPageViewModel, MainPageView>();
        }
    }
}

using QuizApplication.Services;
using QuizApplication.ViewModels.MainPagesViewModels;

namespace QuizApplication.ApplicationSetup
{
    public static class StartupNavigation
    {
        public static void NavigateToInitialPage(INavigationService navigationService)
        {
            navigationService.NavigateTo(new MainPageViewModel());
        }
    }
}

here’s the file App.axaml.cs.

using Avalonia;
using Avalonia.Controls.ApplicationLifetimes;
using Avalonia.Data.Core.Plugins;
using Avalonia.Markup.Xaml;
using QuizApplication.ApplicationSetup;
using QuizApplication.Services;
using QuizApplication.ViewModels;
using QuizApplication.Views;

namespace QuizApplication
{
    public partial class App : Application
    {
        public override void Initialize()
        {
            AvaloniaXamlLoader.Load(this);
        }

        public override void OnFrameworkInitializationCompleted()
        {
            INavigationService navigationService = null!;

            if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
            {
                // Line below is needed to remove Avalonia data validation.
                // Without this line you will get duplicate validations from both Avalonia and CT
                BindingPlugins.DataValidators.RemoveAt(0);
                desktop.MainWindow = new MainWindow
                {
                    DataContext = new MainViewModel()
                };

                navigationService = new NavigationService(desktop.MainWindow);
            }
            else if (ApplicationLifetime is ISingleViewApplicationLifetime singleViewPlatform)
            {
                var mainView = new MainView
                {
                    DataContext = new MainViewModel()
                };

                singleViewPlatform.MainView = mainView;
                navigationService = new NavigationService(mainView);
            }

            PagesRegistration.RegisterPagesMapping(navigationService);

            StartupNavigation.NavigateToInitialPage(navigationService);

            base.OnFrameworkInitializationCompleted();
        }
    }
}

I don’t know if these files are necessary, but I’m going to add

index.html

<!DOCTYPE html>
<html>

<head>
    <title>QuizApplication.Browser</title>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="./app.css" />
</head>

<body style="margin: 0; overflow: hidden">
    <div id="out">
        <div class="avalonia-splash">
            <h2>
                Powered by
                <a href="https://www.avaloniaui.net/" target="_blank">
                    <svg width="266" height="52" viewBox="0 0 266 52" fill="none" xmlns="http://www.w3.org/2000/svg">
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                    </svg>   
                </a>
            </h2>
        </div>
    </div>
    <script type='module' src="./main.js"></script>
</body>

</html>

app.css

/* HTML styles for the splash screen */
.avalonia-splash {
    position: absolute;
    height: 100%;
    width: 100%;
    background: white;
    font-family: 'Outfit', sans-serif;
    justify-content: center;
    align-items: center;
    display: flex;
    pointer-events: none;
}

/* Light theme styles */
@media (prefers-color-scheme: light) {
    .avalonia-splash {
        background: white;
    }

    .avalonia-splash h2 {
        color: #1b2a4e;
    }

    .avalonia-splash a {
        color: #0D6EFD;
    }
}

@media (prefers-color-scheme: dark) {
    .avalonia-splash {
        background: #1b2a4e;
    }

    .avalonia-splash h2 {
        color: white;
    }

    .avalonia-splash a {
        color: white;
    }
}

.avalonia-splash h2 {
    font-weight: 400;
    font-size: 1.5rem;
}

.avalonia-splash a {
    text-decoration: none;
    font-size: 2.5rem;
    display: block;   
}

.avalonia-splash.splash-close {
    transition: opacity 200ms, display 200ms;
    display: none;
    opacity: 0;
}

I have the main.js and Program.cs files for the browser by default too

I realize this is a very long question, but please help.

ChatGPT didn’t give a good answer