When using Petite Vue with the Windows UMP WebView control, it throws an exception PetiteVue is not defined. The same code works in Chrome and Edge browsers.

<Page
x:Class="UMP_Browser.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:UMP_Browser"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

<Grid>
    <WebView x:Name="WebViewControl" Source="**https://v21y4.csb.app/global-scope-petite.html**" />
</Grid>
</Page>

Is there some setting on the UMP WebView control that needs to be set? I am using the latest Windows SDK and Visual Studio.

To see the exception in the WebView, you can use an exception handler like this

 try {
      PetiteVue.createApp(data).mount('#app');
 }
 catch (err) {
      document.getElementById("demo").innerHTML = err.message;
 }

Thanks, Ash