Styling of TOC item labels

[hyanwong]

I would like to be able to target specific TOC labels in the sidebar with styling (e.g. using CSS in the HTML rendering). This would, for example, allow me to visually flag up chapters that are not yet completed

Describe the solution you'd like

I wonder if there could be an option to set the html class name, e.g.

  - file: my_chapter
    options:
      class: unfinished

Describe alternatives you've considered

Another possibility would be to allow e.g. html markup in the "title" field:

  - file: my_chapter
    title: <em>An unfinished chapter</em>

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[hyanwong]

Actually, I see that styling within the section header is passed through to the TOC page, e.g.

# _italic chapter_

So perhaps it's just a question of documenting this, and a way to style the chapter title e.g. using colour or raw html?