Tests for CSS Regions + selection submitted for review

Hi,

I've submitted a suite of tests for CSS Regions that cover selection behavior. Since they require mouse movement, they're manual, but the verification is automated using testharness.js.  They're authored this way in an attempt to import and submit the same files to Webkit, where they run completely automated using WK internal stuff.

If anyone is interested and knowledgeable about Regions, I'd much appreciate your time reviewing them.

Cheers,
-Rebecca