Code Player

[Jim Brown]

Here is a great site for coding, if you are interested in learning Javascript, HTML, CSS.
It has many examples and allows you to modify the code online, with an output window showing the immediate results of your changes:

http://thecodeplayer.com/

Heres' a fun HTML/CSS Android render:
http://thecodeplayer.com/walkthrough/css3-android-logo

 

[LucaMs]

This is also very good.

http://www.html.it/

But it is not for everyone; guess why