[whatwg] "All" checkbox possible?

[Stephen Touset]

Will it be possible in HTML5 to write a checkbox with an "all" option  
without resorting to JavaScript? The pattern I'm thinking of seems  
common: a mixture of radio button and checkbox, by having an "all"  
selection which preempts all individual selections, disabling/ 
unchecking them, and individual ones which uncheck the "all" button.

This seems like a pretty common use-case, and if it could be done  
without resorting to JavaScript, that would be extremely useful.

-- 
Stephen Touset
stephen at touset.org