drhowarddrfine - 7:25 pm on Jan 2, 2013 (gmt 0)

HTML5 has nothing to do with it. The CSS is the same, too, though you might look into 'background-size'.

So you're probably looking for advice on how to do what you want but I started at 4:50AM for a site going live in an hour or so and I'm just too tired.