#CSS Text-preprocessing Properties

There should be a reusable PropertyParser that resolves content-generation CSS properties, so that callers only need to deal with plain text.

• [x] content:
• [ ] text-transform:
• [ ] unicode-bidi:
• [x] white-space:
• [x] counter-reset:
• [x] counter-increment:
• [x] counter-set:
• [x] content: counter()
• [x] content: counters()
• [ ] @counter-style
• Lists?
• Others?

It occurs to me that maybe I should upstream Rhapsode's counters implementation to get this started.