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Docs: Add hedgedoc flavored markdown reference

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Signed-off-by: Philip Molares <philip.molares@udo.edu>
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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).
These tables will tell you what exactly we support in HedgeDoc 1.x (HFM 1) and HedgeDoc 2 (HFM 2).
## Typography
| Feature | HFM 1 | HFM 2 | CommonMark | GFM |
|---------------|:-----:|:-----:|:-------------------:|:-----------------:|
| bold | ☑️ | ☑️ | ☑️ | ☑️ |
| italic | ☑️ | ☑️ | ☑️ | ☑️ |
| underline | ☑️ | ☑️ | (☑️ with `<ins>`) | (☑️ with `<ins>`) |
| strikethrough | ☑️ | ☑️ | (☑️ with `<del>`) | ☑️ |
| subscript | ☑️ | ☑️ | (☑️ with `<sub>`) | (☑️ with `<sub>`) |
| superscript | ☑️ | ☑️ | (☑️ with `<sup>`) | (☑️ with `<sup>`) |
| marked | ☑️ | ☑️ | (☑️ with `<mark>`) | (☑️ with `<mark>`) |
## Extended typography features
| Feature | HFM 1 | HFM 2 | CommonMark | GFM |
|--------------------------------|:-----:|:-----:|:----------:|:---:|
| heading | ☑️ | ☑️ | ☑️ | ☑️ |
| inline code | ☑️ | ☑️ | ☑️ | ☑️ |
| indented code blocks | ☑️ | ☑️ | ☑️ | ☑️ |
| code block with language[^highlight] | ☑️ | ☑️ | ☑️ | ☑️ |
| code block with extra features[^extra-code] | ☑️ | ☑️ | | |
| block quote | ☑️ | ☑️ | ☑️ | ☑️ |
| name tag (`[name=...]`) | (☑️)[^in-bq-list] | ☑️ | | |
| time tag (`[time=...]`) | (☑️)[^in-bq-list] | ☑️ | | |
| color tag (`[color=...]`) | (☑️)[^in-bq-list] | ☑️ | | |
| unorderd list | ☑️ | ☑️ | ☑️ | ☑️ |
| ordered list | ☑️ | ☑️ | ☑️ | ☑️ |
| task list | ☑️ | ☑️ | | ☑️ |
| defition list | ☑️ | ☑️ | | |
| emoji | [Unicode 6.1][unicode-6] | [Unicode 13][unicode-13] | | |
| [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.
[^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.
[^mj]: LaTeX is rendered with [MathJax][mathjax].
[^kt]: LaTeX is rendered with [KaTeX][katex].
## Links & Images
| Feature | HFM 1 | HFM 2 | CommonMark | GFM |
|-----------------------|:-----:|:-----:|:----------------:|:----------------:|
| link | ☑️ | ☑️ | ☑️ | ☑️ |
| link reference | ☑️ | ☑️ | ☑️ | ☑️ |
| link title | ☑️ | ☑️ | ☑️ | ☑️ |
| autolink with `<>` | ☑️ | ☑️ | ☑️ | ☑️ |
| autolink without `<>` | ☑️ | ☑️ | | ☑️ |
| footnotes | ☑️ | ☑️ | | |
| image | ☑️ | ☑️ | ☑️ | ☑️ |
| image with given size | ☑️ | ☑️ | (☑️ with `<img>`) | (☑️ with `<img>`) |
| table of contents | ☑️ | ☑️ | | |
## Structural elements
| Feature | HFM 1 | HFM 2 | CommonMark | GFM |
|-------------------|:------------------------:|:------------------------:|:--------------------:|:--------------------:|
| table | ☑️ | ☑️ | (☑️ with `<table>`) | ☑️ |
| horizontal line | ☑️ | ☑️ | ☑️ | ☑️ |
| collapsable block | (☑️ with `<details>`) | ☑️ | (☑️ with `<details>`) | (☑️ with `<details>`) |
| 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.
| Feature | HFM 1 | HFM 2 | CommonMark | GFM |
|--------------------------|:-----:|:------------------:|:----------:|:---:|
| PDF (`{%pdf ... %}`) | ☑️ | removed | | |
| [YouTube][youtube] (`{%youtube ... %}`) | ☑️ | with plain link[^embed] | | |
| [Vimeo][vimeo] (`{%vimeo ... %}`) | ☑️ | with plain link[^embed] | | |
| [Slideshare][slideshare] (`{%slideshare ... %}`) | ☑️ | removed | | |
| [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.
## HTML
Besides the basic HTML typography elements (`<p>`, `<a>`, `<b>`, `<ins>`, `<del>`) the following more special HTML elements are supported by some specification.
| Feature | HedgeDocMark 1 | HedgeDocMark 2 | CommonMark | GFM |
|:-------------:|:--------------:|:--------------:|:----------:|:---:|
| `<title>` | | | ☑️ | |
| `<textarea>` | | ☑️ | ☑️ | |
| `<style>` | ☑️ | ☑️ | ☑️ | |
| `<xmp>` | | | ☑️ | |
| `<iframe>` | ☑️ | ☑️ | ☑️ | |
| `<noembed>` | ☑️ | | ☑️ | |
| `<noframes>` | ☑️ | | ☑️ | |
| `<script>` | | | ☑️ | |
| `<plaintext>` | | ☑️ | ☑️ | |
[fa]: https://forkaweso.me/
[youtube]: https://www.youtube.com/
[vimeo]: https://vimeo.com/
[slideshare]: https://www.slideshare.net/
[speakerdeck]: https://speakerdeck.com/
[gist]: https://gist.github.com/
[mathjax]: https://www.mathjax.org/
[katex]: https://katex.org/
[gfm]: https://github.github.com/gfm/
[commonmark]: https://spec.commonmark.org/
[unicode-6]: https://unicode.org/versions/Unicode6.1.0/
[unicode-13]: https://unicode.org/versions/Unicode13.0.0/

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@ -9,6 +9,8 @@ nav:
- Home: index.md
- Interface:
Toolbar: interface/toolbar.md
- References:
'HedgeDoc Flavored Markdown': references/hfm.md
- Developer:
- '2.0 Development': dev/2.0.md
- 'User Profiles & Authentication': dev/authentication.md