gonafr

Check content and create a widget menu with links that point to words between the HTML tags you choose. 
It was initially thought and created for the HTML tags of the titles (h1, h2, h3…), but you can use it in other situations.

Anchors Menu

Check content and create a widget menu with links that point to words between the HTML tags you choose.

jamesckemp

Simply use the <code>[toc content=".your-container"]</code> shortcode to automatically generate a table of contents for any HTML container.
The shortcode accepts a number of parameters:
<ul>
<li><code>content</code> string required 
A CSS selector indicating the container of your content.</li>
<li><code>headers</code> string 
A comma separated list of heading selectors that you want to include.</li>
<li><code>speed</code> int 
Speed of sliding back to top.</li>
<li><code>anchor-class</code> string 
Class of anchor links.</li>
<li><code>anchor-text</code> string 
Prepended or appended to anchor headings. Leave blank to disable anchor links.</li>
<li><code>top_class</code> string 
Back to top button or link class.</li>
<li><code>spy</code> true/false 
Enable scroll spy. This will highlight the list items as you scroll past them.</li>
<li><code>position</code> append/prepend 
Position of anchor text.</li>
<li><code>spy-offset</code> int 
Specify heading offset for spy scrolling.</li>
</ul>

Shortcode Table of Contents

Display an automated table of contents via shortcode.

Anchors Menu vs Shortcode Table of Contents