Best learning resource for HTML5/CSS3 for a programmer? [closed]

Question

I was just wondering what you thought would be the best education material for HTML5/CSS3 is (not older web technologies) for a guy who is just a programmer (i.e. mostly C/C++, Java, Pascal, and Python)? Reason I ask, is because the HTML and CSS syntax mostly confuses me, and there are some things I just do not understand (e.g. the float styling attribute, I usually just end up putting that somewhere and hoping it works, if not, try putting it somewhere else). So I was hoping there was an explicit guide/tutorial on getting a programmer up to speed on HTML5/CSS3.

Alternatively, if there is no direct answer to that question, then what is a good learning resource for HTML5/CSS3 and what are the pitfalls/shortcomings (if any) in the markup language that I/others might encounter on this journey/transition?

Keep in mind I have minimal experience writing HTML/CSS markup, and have written no HTML5/CSS3 markup at all.

Regards and thank you in advance. :-)

EDIT: I hoped someone would answer my initial question: is there any nice documentation for programmers to easily pick up the language? (not really after a guide designed for absolute language beginners, just a nice transitional document).

Answer 1

I personally have used treehouse which is very helpful...

Link: Tree House

Referral Link: Tree House - Referral Link

If you are a student you can email for student discount as well!

EDIT

So here is the best documentation places to use for referring back to:

Stack Overflow - Good for if you have something you are stuck with to ask

W3Schools - HTML - Good for simple guides and tutorials

W3Schools - CSS - Good for simple guides and tutorials

PHP.net - PHP Manual - Definitely the place I would say most PHP coders use to refer back to for help

W3C - HTML & CSS - This website is basically the industry standard regulator, you will find alot of websites have the W3C HTML Valid image