The following article is intended for demonstration purposes and shows how animation in CSS3 can be used to create analog clock with responsive design.
calc is a fairly new but still very rarely used feature in CSS3. It allows you to perform simple arithmetic operations directly in style descriptions using all sorts of units.
CSS3 introduces an extension on the media types you might already use in HTML4 and CSS2. These media types allow you to define style sheets specifically for screen and print media types, as well as others. But with CSS3 media queries, you can be more precise about where exactly you want to apply the styles it defines.
This article describes how to create a simple image slider with a responsive design using only CSS3. This slider may look identical to the previous one, but now it has a new operating principle.