How do I compete the transformation matrix needed to transform a rectangle into a trapezium?

Question

I\'m playing around with css transforms and the equivalent filters in IE, and want to simulate perspective by transforming a 2d rectangle into a trapezium.

Specifica

Answer 1

Ah - thinking a little more, 2d matrix transforms can only rotate, skew or transform. That means that lines that are parallel before transformation are parallel afterwards.

I'll leave this question here in case anyone else falls into the same line of thinking!