// Visitor FFI (HtmlVisitorBridge)
[DllImport(LibName, CallingConvention = CallingConvention.Cdecl, EntryPoint = "{{ fn_bridge_new }}")]
internal static extern IntPtr HtmlVisitorBridgeNew(IntPtr vtable, IntPtr userData);
[DllImport(LibName, CallingConvention = CallingConvention.Cdecl, EntryPoint = "{{ fn_bridge_free }}")]
internal static extern void HtmlVisitorBridgeFree(IntPtr bridge);
[DllImport(LibName, CallingConvention = CallingConvention.Cdecl, EntryPoint = "{{ fn_options_set }}")]
internal static extern int ConversionOptionsSetVisitor(IntPtr options, IntPtr visitor);