RAI launched its teletext service, called Televideo, in 1984, with support for Latin character set. Mediaset, the main commercial broadcaster, launched its Mediavideo Teletext in 1997. These developments are covered by the different World System Teletext Levels. In France, where the SECAM standard is used in television broadcasting, a teletext system was developed in the late 1970s under the name Antiope. It had a higher data rate and was capable of dynamic page sizes, allowing more sophisticated graphics. It was phased out in favour of World System Teletext in 1991. In North America NABTS, the North American Broadcast Teletext Specification, was developed to encoding NAPLPS teletext pages, as well as other types of digital data. NABTS was the standard used for both CBS's ExtraVision and NBC's very short-lived NBC Teletext services in the mid-1980s. Japan developed its own JTES teletext system with support for Chinese, Katakana and Hiragana characters. Broadcasts started in 1983 by NHK. In 1986 the four existing teletext systems were adopted into the international standard CCIR 653 (now ITU-R BT.653) as CCIR Teletext System A (Antiope), B (World System Teletext), C (NABTS) and D (JTES). Decline The World Wide Web began to take over some of the functions of teletext from the late 1990s. However, due to its broadcast nature, Teletext remained a reliable source of information during times of crisis, for example during the September 11 terrorist attacks when webpages of major news sites became inaccessible because of the high demand. As the web matured, many broadcasters ceased broadcast of Teletext — CNN in 2006 and the BBC in 2012. In the UK the decline of Teletext was hastened by the introduction of digital television, though an aspect of teletext continues in closed captioning. In other countries the system is still widely used on standard-definition DVB broadcasts. A number of broadcast authorities have ceased the transmission of teletext services. International broadcasters: A live teletext is no longer available on CNN International. Although many pages are still available, they have not been updated since 31 October 2006. United Kingdom: the founder of the world's first teletext service, the BBC, closed its Ceefax service in 2012 when Britain adopted a fully digital television broadcast system. The BBC maintains a Red Button service on digital TV which includes access to the latest text news; that text news service is accessible on the BBC News Channel and during BBC One