1.18.
Auto-generated tables of contents
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Sometimes you have a long document that you want to present in a single page. One solution is to add a table of contents at the top that allows readers to skip ahead to the section they are interested in.
Maintaining such a table of contents manually is error-prone, not to mention boring. That's why Plone gives you the ability to enable an always-updated, automatically generated table of contents for pages that need it. It supports nested chapters based on the headers you already have in your document.
This saves you boring grunt work, and makes your document easier to read and navigate.