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?
Also: How hard would it be to embed the respective platform's native browser oneself? Can I obtain a handle for a JFX panel that I can then give to WinAPI? How much would that interfere with the compositing and rendering done by prism? Being able to obtain a handle would (in my naive view) theoretically allow to include another OpenGL context in an JFX app. Albeit I'm afraid that prism wouldn't be happy about this either.