One div is a project aiming to enhance and deepen the use of CSS3 using a library of logos. The icons featured on the website are in pure css, and done with a single html div. It is a bit similar to using SVG (vectors) and they can be resized without quality loss. They also can be used in a responsive design and these icons can also benefit from animation effects. All designers and developers are welcome to contribute their own icon ideas. There are some browser compatibility issues but the creators try hard to make them compatible in Chrome, Firefox and Safari.