Assembly: PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
is only applied when a Page is hosted directly by a window, which includes:
The minimum width of the Windows Internet Explorer window is 250 pixels. For browser-hosted pages, this means that the value of may not be applied if it would cause the total width of the Windows Internet Explorer window to be less than 250 pixels.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2