It doesn't unfortunately but this is something that we have discussed internally about targeting. We would be interested to hear about your use-case for it!
I'm just picky about maintaining purity of the term "OS".
If "OS" can include WebKit and Lua and anything with a file API and an interpreter then "OS" just means "an abstraction" and I don't need two words for the same thing
Like, Chrome is not an OS, no matter how big a bonus someone at Google got for that clever bit of marketing.