The Selectors page does not document ~= and |= for attributes

The not() and add() methods allow a jQuery object as an argument, but this is not explicitly stated in the documentation. They list Array<Element> but not jQuery

The offsetParent() method is listed in the Traversal section rather than in the CSS section with the other offset methods. I don't think it belongs in the Traversal section: it is the only method listed there that doesn't call pushStack, and the only one that operates only on this[0] rather than the full set of elements.

The closest() method is documented with its selector argument as optional, but I think it is actually required for this method.

The Callback section of the Variable Types page uses "scope" where it means "context". Twice, I think.

The Variable Types page defines a Selector type for selector strings. But the API documentation usually seems to call these Expressions. It seems to me that Selector would be a much more specific and clearer term.

The css() method accepts a function as its second argument, but this is undocumented.