On Mon, 21 May 2007, Matthew Brown wrote:
In such forums, the readers don't expect every thread to be in the business of spoilers, so a post that breaks the default assumption should carry warnings. ... This situation DOES NOT EXIST on Wikipedia. One doesn't go to our article on a fictional topic expecting light banter about the characters or a discussion of their relative hotness. One expects the whole deal, all important information.
This situation DOES exist on Wikipedia. The readers don't expect every part of the article to be in the business of spoilers; they don't discuss how hot the characters are, but they do discuss other things which are not spoilers.
One "expects the whole deal" only on a per-article basis, not on a per-section but spoilers can be put on individual sections, or even within a section if the spoiler doesn't appear at its top.