With Tikiwiki(http://tikiwiki.org), you change indidually the size of the aera when you edit a page.
I found quickly a tikiwiki working where you can see it in action (because sandbox is desactivated on http://tikiwiki.org and others) http://afia.lri.fr/TikiWiki/tiki-editpage.php?page=sandbox
Wiki
dfwiki - modification page => blocks pushed out of the right screen side
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