When I need a marker like this I use a code span, like

    `--pause`

``````lua
-- Look for a paragraph
function Para (para)
  -- With only one child
  if 1 == #para.content then
    local child = para.content[1]
    -- Which is a code span
    if 'Code' == child.type then
      -- Ignore it if it has a class .code, i.e. `--pause` is a marker, but
      -- `--pause`{.code} is "actual" code.
      if child.classes:includes('code') then
        return nil
      end
      -- If it is the marker return some block content
      if '--pauae' == child.text then
        return whatever()
      end
    end
  end
  return nil
end
``````


Den ons 25 aug. 2021 10:24Axel Rauschmayer <rauschma-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> skrev:

> For two filters of mine, I’d like to use a singleton block construct that
> triggers them via a class. I was considering using a horizontal rule:
>
> ---{.pause}
>
> Alas, that doesn’t work. What is a good alternative? If there isn’t any, I
> can use the following syntax, but I’d prefer something that fits into a
> single line.
>
> ::: pause
> :::
>
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