If you ask me, the worst kind of bugs are for modules or properties that a browser claims to support, but not entirely so. IE has supported CSS keyframe animations since IE 10. However, I recently discovered a bug in the latest version.

If you’re using CSS3 properties for graceful degradation, it’s probably fine to drop vendor-prefix support for certain properties. It’s best to educate clients about future maintenance woes and why it’s absolutely fine if Firefox 3.6 users will see square corners and no shadows, as long as you’re not breaking the site's layout.

Captions on hover are smoother and cooler with a touch of animation. With the power of CSS3, we can create transitions that are hardware accelerated and therefore performance-optimised (or way faster!) than anything you can cook up with Javascript.