I just wanted to let folks know that I've posted a proposal for adding advanced font feature support to CSS to the www-style mailing list.
The basic idea is to enable control of ligatures, alternates, swashes and numerical formatting features available in OpenType and AAT fonts within webpages in a relatively simple manner. The proposal lists specific mappings of font-variant-xxx properties/values to OpenType/AAT features but I don't expect to get this right the first time, I'm sure it will take a few iterations to hone. I'm especially interested in hearing about features omitted or overlooked that folks feel are actually valuable to support.
Any comments/thoughts/ideas would be most helpful, posted here or on the www-style mailing list.