drhowarddrfine - 3:08 am on Feb 22, 2013 (gmt 0)
IE8 and IE9 will NEVER have transitions.
for browsers that don't support transitions yet (IE8 and IE9).
I would be very careful about any articles about current practices from Microsoft as their articles tend to be backwards, old or make sideways statements and there are far, far better articles anywhere else.
I was going to quote one of the lines I saw in that article when I noticed two things. 1) It is a year and a half old and its warnings about support for CSS transitions does not apply to any modern browser (that is, the warnings only apply to IE) and 2) it's written by Addy Osmani which means, for an almost 2-year old article, it has creditability.
In any case, it's always better to look for such things from Mozilla's MDN or even find articles like this one from John Resig: