I would never ever provide fallback for css3 transitions.. Let’s take the most basic example. You have transitions on all the links in your site. Cool! On hover, all the links will smoothly change their color. On IE8 the color will change without any transition. You want me to provide a js fallback for hovering and stuff like that?! Come on..
Pfew, how to make a mountain out of a mole-hill huh haha
I use CSS transitions, some of them have a fallback, others don’t. If the site still is fully accessible, functional and without a broken layout in a browser that doesn’t support the CSS transitions: hooray! the site is perfectly fine!
Creating too many fallbacks and trying to do every transition with a JS fallback will only slow the site down for good oldIE