The NSDictionary object containing all names and values of all attributes of the plug-in’s associated HTML element, as well as all names and values of the parameters to be passed to the plug-in. For example, this dictionary will contain all PARAM elements within an APPLET element. If attribute and parameter names conflict, the attributes of an element take precedence over any of its parameters. All keys and values in this dictionary must be of type NSString. Required key.
An object that conforms to the WebPlugInContainer informal protocol. This object is used for callbacks from the plug-in to the enclosing application. If WebPlugInContainerKey is nil, no callbacks will occur.
A Boolean value indicating whether the plug-in should load its own main resource (the src URL, in most cases). If true, the plug-in should load its own main resource. If false, the plug-in uses the data provided by WebKit and the webPlugInMainResourceDidReceiveData: message is sent to the plug-in when data is received. The default value is false.