Invoking PInvoke from Silverlight

Hi All

It is possible to use unmanaged Windows code on a Windows platform and invoke it from WPF and UWP applications (using PInvoke). Now, in the case of a Silverlight application, which is cross-browser and cross-platform compatible, is it possible to write native (unmanaged) code and invoke it from the Silverlight application using PInvoke? Can this approach be used on non-Windows platforms too?

Thanks
Steven