In Moodle 3.9, in a Wiki activity, with HTML editor enabled, it is not possible to automatically create a Table of Contents with the ATTO text formatting header options.
The headers do appear, but a TOC doesn't display, as can be seen in the screenshots attached.
To reproduce the issue:
- Create a course
- Add a wiki
- Set the wiki to HTML editor
- Create a page with at least a large, medium and small header using the ATTO text editor and save
- Check to see if a TOC appears
If a TOC doesn't appear, check to see if the HTML contains 'clean' header tags, e.g. <h3></h3>, <h4></h4> or <h5></h5>. You'll see the header tags contain dir and class.
I found these issues to occur in ATTO using Firefox and Chrome, not in Safari.
Note: When you directly edit the HTML to remove the dir and class code from a header tag, that may solve part of the issue.
The TOC creation seems to depend on 'clean' header tags.