Setting an element's visibility property to visible has no effect when it has a hidden parent.
Created attachment 71798 [details] Test case Attached is a test case. Clicking the 'show' link should reveal the text 'Boo!'.
<rdar://problem/7867739>
Created attachment 71801 [details] Patch
Committed r70497: <http://trac.webkit.org/changeset/70497>