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 136,851 websites that are Easy Table of Contents Customers. We know of 95,192 live websites using Easy Table of Contents and an additional 41,659 sites that used Easy Table of Contents historically and 58,115 websites in the United States.
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Get a list of 136,851 websites using Easy Table of Contents which includes location information, hosting data, contact details, 95,192 currently live websites and an additional 19,384 domains that redirect to sites in this list. 41,659 sites that used this technology previously and 58,115 websites in the United States currently using Easy Table of Contents.