swa66 - 3:14 pm on Aug 5, 2013 (gmt 0)
That could be achieved using SVG (Scalable Vector Graphics).
And you can style SVG using CSS.
It's not going to be a curved div, but you can have curved vector content.
IE and SVG is another story, MSFT only embraced the SVG standard since IE9. But there are polyfills for IE8 (not tried that myself - I never had the need for IE8 to look perfect enough)