Yeah that's what I meant, I'm pretty sure it's isolated by each domain for privacy reasons. * example.com -> GET cdnjs.com/jquery * another.com -> GET cdnjs.c

Yeah that's what I meant, I'm pretty sure it's isolated by each domain for privacy reasons. * example.com -> GET cdnjs.com/jquery * another.com -> GET cdnjs.com/jquery (not cached from example.com) No caching of the CDN assets between sites within the browser, regardless of HTTP caching headers.