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 99,291 websites that are Easy Table of Contents Customers. We know of 78,040 live websites using Easy Table of Contents and an additional 21,251 sites that used Easy Table of Contents historically and 47,291 websites in the United States.
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Get a list of 99,291 websites using Easy Table of Contents which includes location information, hosting data, contact details, 78,040 currently live websites and an additional 16,465 domains that redirect to sites in this list. 21,251 sites that used this technology previously and 47,291 websites in the United States currently using Easy Table of Contents.