Transforms in CSS

Ever since the inception of Cascading Style Sheets (CSS), elements have been rectangular and firmly oriented on the horizontal and vertical axes. A number of tricks arose to make elements look like they were tilted and so on, but underneath it all was a rigid grid. In the late 2000s, an interest grew in being able to break the shackles of that grid and transform objects in interesting ways—and not just in two dimensions.
Eric A. Meyer, Transforms in CSS

Petit guide, “gratuit”, pour manipuler, en 3D et en CSS, les images.