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Merge pull request #1091 from hedgedoc/improvement/add-hfm-docs
[Docs] Add "HedgeDoc flavored markdown" page
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David Mehren
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docs/content/references/hfm.md
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docs/content/references/hfm.md
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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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- Migration Troubleshooting: guides/migration-troubleshooting.md
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- Terms of Use Setup: guides/providing-terms.md
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- Terms of Use Setup: guides/providing-terms.md
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- Configuration: configuration.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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- Developer:
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- 'Getting Started': dev/getting-started.md
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- 'Getting Started': dev/getting-started.md
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- API: dev/api.md
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- API: dev/api.md
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