Not all headings appear in the Quarto table of contents

[daslu]

This is probably a Quarto problem. We mention it here first, and may open a Quarto issue after learning the situation a little more.

Following a report of jason1903 in Slack, we see the following. (using Quarto version 1.5.10 pre-release)

The following Quarto document:

---
format:
  html:
    toc: true
---

# A

## AB

### ABC

renders as follows (not showing ABC in the table of contents):

[daslu]

Verified this behavior in Quarto pre-release version 1.5.32 (the most recent one at the moment).

[genmeblog]

What about setting toc-depth 3?

[daslu]

Updating following the the Slack thread:

• Some of the problems I experienced (e.g. the one above) were not because the toc items were hidden, but because they were collapsed (and then can be expended when scrolling to the relevant region in the page). :toc-expand 4 makes sure they are expanded by default.

• There is another problem that happens when mixing markdown headings and inline html headings, as Jason commented in Slack.

E.g.,

# One Hash

## Two Hashes

### Three Hashes As Clj Comment

### Three Hashes In `kind/md`

```{=html}
<div><h3>An H3 In `kind/hiccup`</h3></div>

This is simply not supposed to be handled by Quarto, as discussed here: https://github.com/quarto-dev/quarto-cli/issues/9738

Many thanks to Jason and the Quarto devs for clarifying this.