Docs: Add footnotes extension

Signed-off-by: Philip Molares <philip.molares@udo.edu>
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Philip Molares 2021-03-28 20:24:45 +02:00 committed by David Mehren
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# HedgeDoc Flavored Markdown
HedgeDoc mostly follows the [CommonMark][commonmark] standard. It shares some extensions with the [GFM][gfm] standard, but for historical reasons HedgeDoc does support not exactly GFM, but a bit more in places (and a bit less in other places).
HedgeDoc has its own markdown dialect which supports many features from [CommonMark][commonmark] and [Github Flavored Markdown][gfm]. It also adds some new extensions and is missing some.
These tables will tell you what exactly we support in HedgeDoc 1.x (HFM 1) and HedgeDoc 2 (HFM 2).
These tables tell you what exactly we support in HedgeDoc 1.x (HFM 1) and HedgeDoc 2 (HFM 2).
## Typography
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| [ForkAwesome][fa] | ☑️ with `<i class='fa'>` | ☑️ with shortcodes | | |
| LaTeX | ☑️[^mj] | ☑️[^kt] | | |
[^highlight]: Code-blocks with a given language are rendered with syntax-highlighting for the code.
[^highlight]: Code blocks with a given language are rendered using syntax highlighting.
[^extra-code]: Several special "language" keywords can be used for rendering diagrams, charts, etc.
[^in-bq-list]: Use of these tags is only supported within blockquotes or (un)ordered lists.
[^in-bq-list]: Use of these tags is only supported within blockquotes and (un)ordered lists.
[^mj]: LaTeX is rendered with [MathJax][mathjax].
[^kt]: LaTeX is rendered with [KaTeX][katex].
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| Alerts | ☑️ | ☑️ | | |
## Embeddings
HFM1 included support for certain embeddings of external content. These were defined in markdown by the uncommon `{%keyword parameter %}` syntax.
Instead of this uncommon syntax, HFM2 uses just plain links to external content and creates embeddings for supported providers.
HFM 1 includes support for certain embeddings of external content by using the `{%keyword parameter %}` syntax. To increase the readability of the markdown code we decided that HFM 2 should just use plain links if possible.
| Feature | HFM 1 | HFM 2 | CommonMark | GFM |
|--------------------------|:-----:|:------------------:|:----------:|:---:|
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| [Speakerdeck][speakerdeck] (`{%speakerdeck ... %}`) | ☑️ | removed | | |
| [GitHub Gist][gist] (`{%gist ... %}`) | ☑️ | with plain link[^embed] | | |
[^embed]: The special syntax is deprecated but will continue to work. However a plain link to the content will generate the same embedding and is preferred.
[^embed]: The special syntax from HFM 1 is deprecated, but will still work in HFM 2. However, a plain link to the content should be used.
## HTML
Besides the basic HTML typography elements (`<p>`, `<a>`, `<b>`, `<ins>`, `<del>`) the following more special HTML elements are supported by some specification.

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permalink: true
- admonition
- attr_list
- footnotes
theme:
name: 'material'
language: en