cHTML is a subset of HTML used for small devices such as smartphones and PDAs. Some HTML features, such as tables, image maps, font styles/variations, background colors, background images, frames, and style sheets are not supported in cHTML. On cHTML devices, basic operations are performed by a combination of four buttons rather than cursor movement, which is one reason why some features (like image maps) are not supported.
cHTML is used exclusively for iMode, a service that is offered only in Japan and several European countries.
Most phones use the older WML format or the newer XHTML Mobile Profile.