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Platforms may optionally provide platform-specific universal command grammars, such as “help”, “cancel”, or “exit” grammars, that are always active (except in the case of modal input items) and which generate specific events. Production-grade applications often need to define their own universal command grammars, e.g., to increase application portability or to provide a distinctive interface. They specify new universal command grammars with elements. They turn off the default grammars with this property. Default catch handlers are not affected by this property. The value “none” is the default, and means that all platform default universal command grammars are disabled. The value “all” turns them all on. Individual grammars are enabled by listing their names separated by spaces; for example, “cancel exit help”. This property is not supported.
This property is not supported by Plum DEV.