Plugin that allows you to insert a table of contents into your posts.
https://wordpress.org/plugins/easy-table-of-contents/
Widgets · WordPress Plugins
Get access to data on 704,766 websites that are Easy Table of Contents Customers. We know of 283,641 live websites using Easy Table of Contents and an additional 421,125 sites that used Easy Table of Contents historically and 136,231 websites in the United States.
Get a list of 704,766 websites using Easy Table of Contents which includes location information, hosting data, contact details, 283,641 currently live websites and an additional 131,052 domains that redirect to sites in this list. 421,125 sites that used this technology previouslyand 136,231 websites in the United States currently using Easy Table of Contents.
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