(static) CUSTOM_MESSAGE :number
The type of a Webapp custom message.
The actual content of the message - you can use this to send information about the message to be displayed to the user.
The title of the message: usually displayed in the header of the notification pop-up.
The type of the message set by the server-side code.
true if the message was generated by some user action, as opposed an error regarding framework's consistency: e.g. parsing error in the CSS. Error messages with this flag set to false should not be displayed visibly to the user, but in the browser's console instead.