C-HTML

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C-HTML (short for Compact HyperText Markup Language), also called i-mode-HTML,^[1] is a subset of HTML for small information devices, such as first generation smart phones and PDAs, such as DoCoMo's i-mode mobile phones used in Japan. C-HTML adds several features not found in standard HTML, notably accesskeys, phone number shortcuts for links, and emoji pictorial characters as locally extended Shift JIS, all concepts borrowed from HDML/WML.

Because small devices such as cellular phones have hardware restrictions such as lower memory, low power CPUs with limited or no storage capabilities, small mono-color display screens, single-character fonts and restricted input methods (the absence of a keyboard or a mouse), there is a need for a simpler form of HTML.^[2]

C-HTML does not support tables, image maps, multiple fonts and styling of fonts, background colors and images, frames, style sheets, and is limited to a monochromatic display.^[3]

The language is defined so that all the basic interactive operations can be done by a combination of four buttons and not by two-dimensional cursor movement: cursor forward, cursor backward, select, and back/stop. Functionality requiring two-dimensional cursor pointing, like image maps, are excluded from C-HTML.

See also

• Comparison of document markup languages
• Information appliance
• List of document markup languages
• Microbrowser

References

1. ^ (PDF) i-mode service guideline, NTT DoCoMo, Inc., 2002-03-04, http://www.nttdocomo.com/binary/technologies/imodetechnology_guideline2002030.pdf 
2. ^ Kamada, Tomihisa (09-Feb-1998), 2.1. Scope of the Products, W3C, http://www.w3.org/TR/1998/NOTE-compactHTML-19980209/#www2-1, retrieved 2009-04-24 
3. ^ Kamada, Tomihisa (09-Feb-1998), 3.1 Design Principles, W3C, http://www.w3.org/TR/1998/NOTE-compactHTML-19980209/#www3-1, retrieved 2009-04-24 

External links

• Compact HTML for Small Information Appliances — W3C NOTE 09-Feb-1998

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