I just looked at the Spark wiki page[1], and Sizzle is a dependency (although they say it can be removed if you're willing to ignore IE 7). So it is separable,

I just looked at the Spark wiki page[1], and Sizzle is a dependency (although they say it can be removed if you're willing to ignore IE 7). So it is separable, but might not be that small depending on your audience. [1] https://github.com/meteor/meteor/wiki/Spark https://github.com/meteor/meteor/wiki/Spark