The most complex part of a web browser engine is rendering

HTML and CSS parsing is easy peasy compared to it.
Cudder, how far is your web browser from a general perspective of actually working as a browser?
Are you still cleaning it up before putting it on public domain?

HTML parser basically done.
CSS parser being worked on (tokeniser part almost done, still needs recursive part and consideration of CSS datastrutures.)
Nothing else.

Not much time because I'm busy with other things. I did test the parser with a 100MB HTML file that crashed all the other browsers I had, and it handled it with no problems, with an expansion of ~5.5 (see https://dis.4chan.org/read/prog/1321853871 for an explanation of what that means.)

Use the existing thread, no need for another one:
http://bbs.progrider.org/prog/read/1406427616