DetailPage.xaml

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<Page x:Class="RssReader.Views.DetailPage"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:local="using:RssReader.Views"
      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"
      x:Name="PageRoot"
      NavigationCacheMode="Enabled"
      Loaded="PageRoot_Loaded"
      Unloaded="PageRoot_Unloaded"
      Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

    <Page.Transitions>
        <TransitionCollection>
            <NavigationThemeTransition />
        </TransitionCollection>
    </Page.Transitions>

    <Grid>
        <MUXC:ProgressBar Margin="24,8"
                     IsIndeterminate="True"
                     Style="{ThemeResource ProgressBarStyle1}" />
        <WebView x:Name="ArticleWebView"
                 Visibility="Collapsed" />
    </Grid>
</Page>