I think a combination of something like TinyXHR (https://gist.github.com/shimondoodkin/4706967 https://gist.github.com/shimondoodkin/4706967) and querySelectorA

I think a combination of something like TinyXHR (https://gist.github.com/shimondoodkin/4706967 https://gist.github.com/shimondoodkin/4706967) and querySelectorAll would suffice for many simple use-cases on modern browsers.