uwpWebView

Add a WebView to the UI

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <WebView x:Name="MyWebView" />
</Grid>

Open a website

MyWebView.Navigate(new Uri("http://www.url.com"));

Open local html page

MyWebView.Navigate(new Uri("ms-appdata:///local/Downloads/index.html"));