[Docs] Add "HedgeDoc flavored markdown" page
Co-authored-by: Philip Molares <philip.molares@udo.edu> Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>
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# HedgeDoc Flavored Markdown
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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).
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These tables will tell you what exactly we support in HedgeDoc 1.x (HFM 1) and will support in HedgeDoc 2 (HFM 2).
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**Please keep in mind that HedgeDoc 2 is still in development and not functional yet.**
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## Typography
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| Feature       | HFM 1 | HFM 2 | CommonMark          | GFM               |
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|---------------|:-----:|:-----:|:-------------------:|:-----------------:|
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| bold          | ☑️     | ☑️     | ☑️                   | ☑️                 |
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| italic        | ☑️     | ☑️     | ☑️                   | ☑️                 |
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| underline     | ☑️     | ☑️     | (☑️ with `<ins>`)    | (☑️ with `<ins>`)  |
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| strikethrough | ☑️     | ☑️     | (☑️ with `<del>`)    | ☑️                 |
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| subscript     | ☑️     | ☑️     | (☑️ with `<sub>`)    | (☑️ with `<sub>`)  |
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| superscript   | ☑️     | ☑️     | (☑️ with `<sup>`)    | (☑️ with `<sup>`)  |
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| marked        | ☑️     | ☑️     | (☑️ with `<mark>`)   | (☑️ with `<mark>`) |
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## Extended typography features
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| Feature                        | HFM 1 | HFM 2 | CommonMark | GFM |
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|--------------------------------|:-----:|:-----:|:----------:|:---:|
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| heading                        | ☑️     | ☑️     | ☑️          | ☑️   |
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| inline code                    | ☑️     | ☑️     | ☑️          | ☑️   |
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| indented code blocks           | ☑️     | ☑️     | ☑️          | ☑️   |
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| code block with language[^highlight]       | ☑️     | ☑️     | ☑️          | ☑️   |
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| code block with extra features[^extra-code] | ☑️     | ☑️     |            |     |
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| block quote                    | ☑️     | ☑️     | ☑️          | ☑️   |
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| name tag (`[name=...]`)        | (☑️)[^in-bq-list]     | ☑️     |            |     |
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| time tag (`[time=...]`)        | (☑️)[^in-bq-list]     | ☑️     |            |     |
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| color tag (`[color=...]`)      | (☑️)[^in-bq-list]     | ☑️     |            |     |
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| unorderd list                  | ☑️     | ☑️     | ☑️          | ☑️   |
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| ordered list                   | ☑️     | ☑️     | ☑️          | ☑️   |
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| task list                      | ☑️     | ☑️     |            | ☑️   |
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| defition list                  | ☑️     | ☑️     |            |     |
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| emoji             | [Unicode 6.1][unicode-6] | [Unicode 13][unicode-13] |                      |                      |
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| [ForkAwesome][fa] | ☑️ with `<i class='fa'>`  | ☑️ with shortcodes        |                      |                      |
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| LaTeX             | ☑️[^mj]                   | ☑️[^kt]                   |                      |                      |
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[^highlight]: Code-blocks with a given language are rendered with syntax-highlighting for the code.
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[^extra-code]: Several special "language" keywords can be used for rendering diagrams, charts, etc.
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[^in-bq-list]: Use of these tags is only supported within blockquotes or (un)ordered lists.
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[^mj]: LaTeX is rendered with [MathJax][mathjax].
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[^kt]: LaTeX is rendered with [KaTeX][katex].
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## Links & Images
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| Feature               | HFM 1 | HFM 2 | CommonMark       | GFM              |
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|-----------------------|:-----:|:-----:|:----------------:|:----------------:|
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| link                  | ☑️     | ☑️     | ☑️                | ☑️                |
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| link reference        | ☑️     | ☑️     | ☑️                | ☑️                |
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| link title            | ☑️     | ☑️     | ☑️                | ☑️                |
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| autolink with `<>`    | ☑️     | ☑️     | ☑️                | ☑️                |
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| autolink without `<>` | ☑️     | ☑️     |                  | ☑️                |
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| footnotes             | ☑️     | ☑️     |                  |                  |
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| image                 | ☑️     | ☑️     | ☑️                | ☑️                |
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| image with given size | ☑️     | ☑️     | (☑️ with `<img>`) | (☑️ with `<img>`) |
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| table of contents     | ☑️     | ☑️     |                  |                  |
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## Structural elements
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| Feature           | HFM 1                    | HFM 2                    | CommonMark           | GFM                  |
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|-------------------|:------------------------:|:------------------------:|:--------------------:|:--------------------:|
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| table             | ☑️                        | ☑️                        | (☑️ with `<table>`)   | ☑️                    |
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| horizontal line   | ☑️                        | ☑️                        | ☑️                    | ☑️                    |
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| collapsable block | (☑️ with `<details>`)     | ☑️                        | (☑️ with `<details>`) | (☑️ with `<details>`) |
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| Alerts            | ☑️                        | ☑️                        |                      |                      |
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## Embeddings
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HFM1 included support for certain embeddings of external content. These were defined in markdown by the uncommon `{%keyword parameter %}` syntax.
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Instead of this uncommon syntax, HFM2 uses just plain links to external content and creates embeddings for supported providers.
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| Feature                  | HFM 1 | HFM 2              | CommonMark | GFM |
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|--------------------------|:-----:|:------------------:|:----------:|:---:|
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| PDF (`{%pdf ... %}`)     | ☑️     | removed            |            |     |
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| [YouTube][youtube] (`{%youtube ... %}`)       | ☑️     | with plain link[^embed] |            |     |
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| [Vimeo][vimeo] (`{%vimeo ... %}`)          | ☑️     | with plain link[^embed] |            |     |
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| [Slideshare][slideshare] (`{%slideshare ... %}`) | ☑️     | removed            |            |     |
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| [Speakerdeck][speakerdeck] (`{%speakerdeck ... %}`) | ☑️     | removed            |            |     |
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| [GitHub Gist][gist] (`{%gist ... %}`)             | ☑️     | with plain link[^embed] |            |     |
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[^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.
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## HTML
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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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|    Feature    | HedgeDocMark 1 | HedgeDocMark 2 | CommonMark | GFM |
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|:-------------:|:--------------:|:--------------:|:----------:|:---:|
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|   `<title>`   |                |                | ☑️          |     |
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|  `<textarea>` |                | ☑️              | ☑️          |     |
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|   `<style>`   | ☑️              | ☑️              | ☑️          |     |
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|    `<xmp>`    |                |                | ☑️          |     |
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|   `<iframe>`  | ☑️              | ☑️              | ☑️          |     |
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|  `<noembed>`  | ☑️              |                | ☑️          |     |
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|  `<noframes>` | ☑️              |                | ☑️          |     |
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|   `<script>`  |                |                | ☑️          |     |
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| `<plaintext>` |                | ☑️              | ☑️          |     |
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[fa]: https://forkaweso.me/
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[youtube]: https://www.youtube.com/
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[vimeo]: https://vimeo.com/
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[slideshare]: https://www.slideshare.net/
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[speakerdeck]: https://speakerdeck.com/
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[gist]: https://gist.github.com/
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[mathjax]: https://www.mathjax.org/
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[katex]: https://katex.org/
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[gfm]: https://github.github.com/gfm/
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[commonmark]: https://spec.commonmark.org/
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[unicode-6]: https://unicode.org/versions/Unicode6.1.0/
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[unicode-13]: https://unicode.org/versions/Unicode13.0.0/
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@ -40,6 +40,8 @@ nav:
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      - Migration Troubleshooting: guides/migration-troubleshooting.md
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      - Terms of Use Setup: guides/providing-terms.md
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  - Configuration: configuration.md
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  - References:
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    - 'HedgeDoc Flavored Markdown': references/hfm.md
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  - Developer:
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      - 'Getting Started': dev/getting-started.md
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      - API: dev/api.md
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