As vendors introduce new versions of browsers, content developers have had to get to grips with a variety of differences between browsers from the same vendor as well as the larger differences between vendors
The range of browser platforms is rapidly expanding to include television sets, handheld organizers, cell phones, in-car systems and regular phones. Each of these platforms presents different capabilities - a one size fits all approach won't work!
Authors want guarantees for how their content is rendered in an increasingly diverse environment
W3C's solution involves:
HTML Activity chartered to work on XHTML profiles
CC/PP Activity chartered to work on browser capabilities