rootWebArea
++genericContainer ignored
++++genericContainer ignored
++++++genericContainer
++++++++genericContainer ignored invisible
++++++++genericContainer name='span-2'
++++++++genericContainer name='span-4'
++++++++++genericContainer ignored invisible
++++++++group name='span-1'
++++++++group name='span-2' labelledbyIds=genericContainer
++++++++group name='span-3' labelledbyIds=genericContainer
++++++++group name='span-4'