Would these need to be in 4 separate tests? I would imagine a browser vendor would implement them all at the same time.

They should probably be under one parent object like video or audio

Modernizr.cssviewportlengths = {
    vh: ...,
    vw: ...
    //etc
}

Chrome 20 implements vw, vh, vmin correctly but there's no support for vmax yet.

Would it be better if I put vw, vh and vmin under one parent object but vmax in a separate test?

seems okay as four separate tests. gzip would wipe out the byte duplication. kinda nice to keep things atomic.

lgtm. you, @ryanseddon ?

@ryanseddon said:

Would these need to be in 4 separate tests? I would imagine a browser vendor would implement them all at the same time.

I think if Modernizr has taught me anything, it’s not to trust browser vendors for sensible things like that. ;-)

It looks good to me, merging.