this would be a revision of : http://github.com/Modernizr/Modernizr/issues/closed#issue/3

fwiw pilgrim refers to this as "HTML5 storage": http://diveintohtml5.org/detect.html
and his test only considers localstorage

the spec calls it Web Storage: http://dev.w3.org/html5/webstorage/

I think they should be tested together (as above) and available as
Modernizer.webstorage

I agree. It's called Web Storage because it encompasses multiple forms of storage, most notably localStorage and sessionStorage. We should test against both and report on both individually, e.g.:

Modernizr.localstorage
Modernizr.sessionstorage

(note the consistent-to-Modernizr use of all-lowercase attributes)

definitely keep them separate. chromium currently only implements localstorage:
http://24ways.org/2009/breaking-out-the-edges-of-the-browser
http://code.google.com/p/chromium/issues/detail?id=4360

sessionStorage and 'x' in window fix for cookies-disabled. closed by 1e0ba91