MainWindow.xaml.cs

using Microsoft.Toolkit.Win32.UI.Controls.WPF;

public partial class MainWindow : Window
{
  public MainWindow()
  {
    InitializeComponent();

    // Initialize a WPF WebView and add it to the Window's Grid
    var wvc = new WebView();
    Grid.Children.Add(wvc);
    wvc.Navigate(new Uri("https://www.microsoft.com"));
  }
}