this is a place where such exploits are posted
http://1337day.com/
i tend to keep tabs on what exploits exist for what browsers i use so i know how to avoid them
most of the exploits are c code snippets, but a lot are also plain html and css
security-wise the most secure browsers go in this order (most secure to least):
- google chrome
- opera
- firefox
- ie
- safari
you can also experiment and audit on your own with tools like mesasploit or nessus.
