Maple/Maple.App/MonacoEditPage.xaml

<Page
    x:Class="Maple_App.MonacoEditPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:Maple_App"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:muxc="using:Microsoft.UI.Xaml.Controls"
    mc:Ignorable="d"
    Loaded="Page_Loaded"
    Unloaded="Page_Unloaded"
    NavigationCacheMode="Required">

    <Grid>
        <muxc:WebView2 x:Name="WebView" WebMessageReceived="WebView_WebMessageReceived" />
    </Grid>
</Page>