Randori (http://randoriframework.com) uses a couple of vendor specific CSS properties to attach behaviour and mediators (-randori-behaviour, -randori-mediator, etc) to HTML views.
I've been able to add our properties programmatically to the code completion using a CompletionContributor, yet, IntelliJ still marks the -randori properties
as invalid in the editor. (I.e. it draws a squigly line beneath it and reports that it is invalid).
Is there a way where I can somehow register these extra properties so that they are perceived as valid by the IDE?