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 703,183 websites that are Easy Table of Contents Customers. We know of 292,907 live websites using Easy Table of Contents and an additional 410,276 sites that used Easy Table of Contents historically and 140,351 websites in the United States.
Get a list of 703,183 websites using Easy Table of Contents which includes location information, hosting data, contact details, 292,907 currently live websites and an additional 135,829 domains that redirect to sites in this list. 410,276 sites that used this technology previouslyand 140,351 websites in the United States currently using Easy Table of Contents.
Countries
Financial
Group
Region