I've already pledged. Helping in avoiding making Chromium the default is icing on top of the cake. Edit: I also want a massively cut down, blazingly fast rend

I've already pledged. Helping in avoiding making Chromium the default is icing on top of the cake. Edit: I also want a massively cut down, blazingly fast rendering engine for a subset of html that is big enough for Wikipedia. Specifically I want it to be paired with a strictly limited version of something like Javascript, only limited and with batteries included. Dynamically updating content on user clicks should be OK, running general calculations should be hard.