The COBWebS spider does not search the entire text of the page for keywords. When a keyword search is done, the keyword score is used as part of the algorithm that orders the pages in the hit list. Otherwise, every dumb word in the body is considered a keyword. That is not a desirable effect. We are going for quality, not quantity, when it comes to keyword matches.
COBWebS expects heading elements to be used for headings only .
It is often used for formatting purposes by employing the align attribute. At the time of this writing, the spider accepts any class, but it may be restricted to certain classes sometime in the future. The spider treats every word in this division as a keyword. It makes sense to do this only if a large percentage of the words in the document are likely to be used in a keyword search. For most documents this would be inefficient, and it would be better to identify the search words in a keywords tag.