How to rotate + flip element with CSS

The transform property lets you rotate or flip, but how can you do both at the same time? Say I want to rotate an element 90 degrees and flip it horizontally? Both are done with the same property, so the latter overwrites the former. Here's an example fiddle for convenience:

http://jsfiddle.net/DtNh6/

transform: rotate(90deg);
transform: scaleX(-1);