CSS pseudo selector ':checked' selects also selected options

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@9722 5f5364db-9458-4db8-a492-e30667be6df6
initial tests for root pseudo selector added

git-svn-id: svn://svn.code.sf.net/p/htmlunit/code/trunk@9723 5f5364db-9458-4db8-a492-e30667be6df6