Ordered lists in HTML number the items as the page loads, which facilitates rearranging items or inserting new ones. Although the default numbers are arabic numerals, there are other possibilities. This page shows how an outline can be made that renumbers itself appropriately when new items are inserted into it.

1. Outline Entry
2. Outline Entry Top Level
   1. Outline Entry Second Level
   2. Ditto
      1. Outline Entry Third Level
         1. Outline Entry Fourth Level
            1. Outline Entry Fifth Level
            2. Outline Entry Fifth Level Again (Exciting, what?!)
            3. Outline Entry With Link Even
         2. Outline Entry Fourth Level Again
         3. Ditto
      2. Outline Entry Third Level Once More
      3. So's This
3. Outline Entry First Level Again
4. Outline Entry First Level Too (Lots of important stuff in this outline.)
   1. Outline Entry Second Level Again
   2. Outline Entry Here Too (Part of all that important stuff.)
   3. Outline Entry Also Here (Except this one is trivial and should have been excluded and will probably attract negative attention from reviewers, who will condemn the entire book on the basis of this one small and largely irrelevant and clearly ill-advised section. Reviewers have to condem something, after all.)
5. Conclusions or Coda Depending on How Linear One's Thinking Is