Reversing the orientation of images is very easy with CSS, if somewhat counter-intuitive for those not mathematically inclined: to flip an image, you use a value of -1 with the CSS transform properties scaleX or scaleY, depending on whether you wish to flip the element horizontally or vertically.
Compared to rotate, the remaining 2D transformations in CSS are probably of less utility: scale and translate have always been available in one form or another in CSS, by modifying element's width and height, or positioning them using relative or absolute position. The primary advantages of using the CSS transform values is that they are more direct, and can be animated with great ease.
Probably the most useful of the transformations, rotate does exactly what it says on the tin: it rotates any element. The browser should not assume the unit of measurement used, so it needs to be included for the rotation: radians (rad), turns (turn) or degrees (deg) for degrees. To provide one example, sans vendor prefixes:
