I don't think that hidden css would qualify as spammy, because of the sites that use javascript to show hidden divs for comments, etc. Another related question

I don't think that hidden css would qualify as spammy, because of the sites that use javascript to show hidden divs for comments, etc. Another related question to the post would be: "Does the Google Bot index the css tag "background-image" for google images?" Edit: removed question answered in a comment below.