The World Wide Web Consortium (W3C) has released the HyperText Markup Language 4.0 specification as "a W3C recommendation. A W3C Recommendation indicates that a specification is stable, contributes to web interoperability, and has been reviewed by all W3C members, who are in favor of supporting its adoption by the industry." Also included is more information about the features of the specification, which include improvements in forms, tables, and frames, as well as markup for multilingual documents and mechanisms allowing tables and forms to be translated into braille or speech. The specification comtains complete indexes of elements and attributes.