Hello, A couple of (hopefully correct) observations on Position.absolutize: - if you set position to absolute in a css class, rather then by using the style property, the check (element.style.position = ''absolute'') will fail. - the width css property on an element does not include padding, but $(''el'').clientWidth and clientHeight do. So when calling absolutize on an element, the size will be increased by the padding. I really don''t know how(if) these problems can be mitigated, nevertheless I think they should at least be included in the documentation. P.S. I wanted to search for tickets regarding this issue but the javascript bugs report on the rubyonrails trac page is broken. (http://dev.rubyonrails.org/report/21).