The Flying Saucer project, a pure Java XML/CSS 2 renderer, has announced the released version 6. They write in, "Release 6 includes: vertical margin collapsing; z-index property and stacking contexts; Vertical-align: top/bottom; PDF rendering via iText; bookmarks, pagination and breaks, etc.; pagination support; rewritten 'float' implementation; improved list marker positioning; and many fixes and performance improvements."