XAML Standard

Both Xamarin.Forms and UWP can utilize declarative UI pages with the EXtensible Application Markup Language (XAML). It was initially introduced as part of Windows Presentation Foundation and has been extensively used in .NET applications, starting with .NET 3.0.

While both development platforms offer similar UI elements, they use a slightly different set of controls and layouts, which might cause UI inconsistencies while you are creating cross-platform applications that target iOS/Android (with Xamarin.Forms) and UWP.

Let's take a look at the layout structures:

UWP	Xamarin.Forms	Notes
StackPanel	StackLayout	Left-to-right or top-to-bottom infinite stacking
Grid	Grid	Tabular format (rows and columns)
Canvas	AbsoluteLayout	Pixel/coordinate positioning
WrapPanel	FlexLayout	Wrapping stack
RelativePanel...