Firefox 3.6 source code: part 2

Some major changes at first glance:

1. nsSpaceManager's gone. The SpaceManager handled CSS floats
2. html.css now includes also style rules for the HTML 5 video element
3. new headers and classes for handling the newly supported CSS features (such as media queries; see /layout/style)

Documentation is still obsolete, but new test cases have been added (all taken from Bugzilla reports.