cHTML is a subset of HTML 4.0. Page Designer supports WML 1.3 and HTML 4.0. Typically, WML files have the file extension .wml and cHTML files have the file name extension .html.
A WML file consists of cards, which are similar to Web pages in HTML. A card represents one interaction with the user, and many cards together create the WML site accessible from mobile devices. You can specify common settings for all cards or you can edit individual cards and attributes. You can create and edit cHTML files as you would any HTML file; however, not all functions are supported for cHTML. By default, unsupported functions for cHTML are disabled in Page Designer so that you can create a cHTML-compliant file.