Latest HTML & CSS Versions

This is not a cut and dry question except for the fact the latest versions are HTML5 and CSS3
W3C HTML5  www.html5rocks.com   W3C CSS3

Your mobile phones will work with any html and css version.  HTML5 and CSS3 have the abilty to interact with the phone.

Is there something specific you are trying to find out or do?

I'm just looking into up to date online courses for HTML and CSS.  

Any ideas?

I would start with w3schools and go through just a bit at a time so you undertand it.

You can practice your code quickly on places like http://jsbin.com/

Start simple and build.   It also helps if you have something real in mind you want to achieve. The first place to start is a piece of paper and pen.  Draw out what you want to  your page to look like first.  

Next in whatever you are comfortable with, try and recreate your drawing in photoshop or powerpoint.  Don't get too crazy but this helps you before you start coding.  Everything on the page is nothing more then a set of rectangles either connected to something or floating around.

At first try avoid the urge to just copy and paste code you have found and instead, type it out by hand and understand what you are doing. Otherwise, it is easy to get lost and figure out why one square is on the top right when you thought it would be mid left.

Bear in mind that HTML5 is technically still in development. But it is realistically the version you should be studying and using.

I have some HTML expierience but outdated without CSS