'''This command is deprecated!'''
Consider using `\{{cmd|feature|[+]{...}` |}} instead; see [[Featuresets]] for details.
{{cmd|setff|{myfontfeatureset}|}} adds the font features in myfontfeatureset to the currently active features. A font feature set can be defined with {{cmd|definefontfeature|[myfontfeatureset]{...}|}}. The added features remain active until the end of the current scope.