[est]

IE introduced expression() in CSS decades ago. Like -webkit-transform, they are both private non-standard way of doing animations. IE4/5/6 even had hardware accelerated 3D graphic and dynamic music support, dHTML was cool before HTML5 coolkids took over.

[ugh]

It’s quite disingenuous to compare CSS transform to expression().

[robin_reala]

expression() gives you a functional method for defining animations; CSS transforms are declarative. They’re a different thing entirely.

Besides, expression evaluates on mousemove which is horrible for performance: http://blog.dynatrace.com/2010/02/16/the-real-performance-ov...

[est]

There are also DXImageTransform filter and VML