Why do you need <> to use space as glue? For the behavior you are proposing you can use Array.

Point of Semigroup instance was to "namespace" classnames like:

app = ClassName "sd-"
app <> ClassName "footer" == ClassName "sd-footer"

I think what @machinedgod wants is to append together a bunch of separate classnames, which should be done with intercalate instead e.g. intercalate " " [a,b,c,d]

My bad, I misunderstood what ClassName was supposed to do, then.
I use it in a way where I keep all classes as constants, and then append them together as necessary. This way I keep strings out of code; I assumed this is what wrapper is supposed to do.

you would be doing:
HH.div [HP.classes [H.ClassName "foo", H.ClassName "bar"]]

ClassName is just a newtype over String so classes take Array of ClassName instead of Array of String.

btw you can take a look at #483 it's also related

Excellent, I wasn't aware of 'classes' property. That does much better.
I guess it was just intuitive for me to use 'append' to append classes together. Maybe the namespacing could be expanded upon, and have a newtype for a namespace with a separate function that applies namespace to every ClassName?

P.S. Also, thanks for pointing out your issue, it gives me a better idea on how to prepare a pull request properly.