How impossible would be the use of plugins such as the Adobe Acrobat Reader or the Mac OS X embedded PDF preview in Safari for WebView? Does the embedded WebKit engine include an implementation of that plugin API or has that been omitted?
It has been omitted. The hardest part is to funnel all the rendering a plugin does through Prism. Not sure if that is at all possible. (Some plugins may just expect to be given a HWND for example)
