Tapestry could inline small image assets directly into CSS stylesheets

I've been working on the code that rewrites url(...) entries inside CSS files, needed for some other features, including CSS aggregation.

It occurs to me that Tapestry could replace urls() to image assets with their base64 encoded content.

The advantage is fewer round-trips to the server; I'm not sure how good support is for older browsers. I don't know what a good value for the cutoff file size (to not inline) would be.