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On WinPhone, there is an interaction between WebView and the LayoutOptions of StackLayout. In the following code (slightly adapted from Forms Gallery), uncommenting the line so that HorizontalOptions is set results in the app failing to display the WebView. Comment the line out again and the WebView displays as expected.
Investigation shows that the WebView has Width and Height both set to -1.
class WebViewDemoPage : ContentPage
WebView webView = new WebView
Source = new UrlWebViewSource
Url = "http://blog.xamarin.com/",
VerticalOptions = LayoutOptions.FillAndExpand
// Build the page.
this.Content = new StackLayout
// Uncomment the below line and this will fail on WinPhone
//HorizontalOptions = LayoutOptions.Start,
I have checked this issue and I am also getting the reported behavior.
Observation: I observed that when I enable the following line webview is not working on windows.
HorizontalOptions = LayoutOptions.Start,
IDE logs: https://gist.github.com/Parmendrak/b0cfd233467c0af27915
Please let me know if I can provide more info to this issue.
Note: I have checked the same on android and I am not getting this behavior with android.
Xamarin.Forms: 126.96.36.19923 and 188.8.131.5274
Microsoft Visual Studio Professional 2013
Version 12.0.30723.00 Update 3
Microsoft .NET Framework
Installed Version: Professional
Xamarin 3.11.666.0 (ebae43a)
Xamarin.Android 184.108.40.206 (5f55a9ef61c11b6ce0890bc91e4c71b1b92be214)
Xamarin.iOS 220.127.116.11 (67b390d0d1bd741582cf7b7fd3ffea08583a3f83)
Created attachment 19156 [details]
I can still reproduce this issue with Forms 2.3.3 and not only on WP8 but also on WinRT and UWP so this seems to affect all the Windows platforms.
If the StackLayout sets Horizontal/VerticalOptions to anything other than Fill/FillAndExpand then this issue will occur.
I've attached a repro project to the report.