low resource web browser

are there any web browsers out there with full support for javascript, and can render html normally? I wouldn't need anything like flash or java applets, but full support for fancy javascript would be nice for getting through fancy web sites and such. If one doesn't exist, I think I might try to make one, and shoot for 5 - 15MB of ram usage.

GUI (tabs, settings, history, downloads)
HTTP client (with some sort of caching)
html5 compliant parsing algorithm
CSS parser
layout engine (+ <form> elements)
javascript interpreter

+ per tab:

all resources used by the page
html converted into dom nodes
events
rendered page

...

break it down for me cudder, where exactly are you going to save so much space as opposed to e.g. chrome? 15mb for all that? I'd like to see that