Ask HN: Any cool examples of Aural CSS?

CSS properties for specifying how a page should sound have been around for a really long time (http://www.w3.org/TR/CSS21/aural.html), but I've never seen/heard it used anywhere, at least to my knowledge.

Do standard browsers even support these features in some way, or do I need to use other software for that? Any information I've found about this seems really outdated.

Are there any sites that do particularly interesting things with aural CSS effects?