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hedgedoc/docs/content/references/hfm.md
Tilman Vatteroth 4f76585664
Fix usage of "HFM" in table headers 
Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>
2021-09-02 22:00:16 +02:00

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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 will support in HedgeDoc 2 (HFM 2).
**Please keep in mind that HedgeDoc 2 is still in development and not functional yet.**
## Typography
| Feature | HFM 1 | HFM 2 | CommonMark | GFM |
|---------------|:-----:|:-----:|:-------------------:|:-----------------:|
| bold | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: |
| italic | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: |
| underline | :ballot_box_with_check: | :ballot_box_with_check: | (:ballot_box_with_check: with `<ins>`) | (:ballot_box_with_check: with `<ins>`) |
| strikethrough | :ballot_box_with_check: | :ballot_box_with_check: | (:ballot_box_with_check: with `<del>`) | :ballot_box_with_check: |
| subscript | :ballot_box_with_check: | :ballot_box_with_check: | (:ballot_box_with_check: with `<sub>`) | (:ballot_box_with_check: with `<sub>`) |
| superscript | :ballot_box_with_check: | :ballot_box_with_check: | (:ballot_box_with_check: with `<sup>`) | (:ballot_box_with_check: with `<sup>`) |
| marked | :ballot_box_with_check: | :ballot_box_with_check: | (:ballot_box_with_check: with `<mark>`) | (:ballot_box_with_check: with `<mark>`) |
## Extended typography features
| Feature | HFM 1 | HFM 2 | CommonMark | GFM |
|--------------------------------|:-----:|:-----:|:----------:|:---:|
| heading | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: |
| inline code | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: |
| indented code blocks | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: |
| code block with language[^highlight] | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: |
| code block with extra features[^extra-code] | :ballot_box_with_check: | :ballot_box_with_check: | | |
| block quote | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: |
| name tag (`[name=...]`) | (:ballot_box_with_check:)[^in-bq-list] | :ballot_box_with_check: | | |
| time tag (`[time=...]`) | (:ballot_box_with_check:)[^in-bq-list] | :ballot_box_with_check: | | |
| color tag (`[color=...]`) | (:ballot_box_with_check:)[^in-bq-list] | :ballot_box_with_check: | | |
| unorderd list | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: |
| ordered list | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: |
| task list | :ballot_box_with_check: | :ballot_box_with_check: | | :ballot_box_with_check: |
| defition list | :ballot_box_with_check: | :ballot_box_with_check: | | |
| emoji | [Unicode 6.1][unicode-6] | [Unicode 13][unicode-13] | | |
| [ForkAwesome][fa] | :ballot_box_with_check: with `<i class='fa'>` | :ballot_box_with_check: with shortcodes | | |
| LaTeX | :ballot_box_with_check:[^mj] | :ballot_box_with_check:[^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 | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: |
| link reference | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: |
| link title | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: |
| autolink with `<>` | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: |
| autolink without `<>` | :ballot_box_with_check: | :ballot_box_with_check: | | :ballot_box_with_check: |
| footnotes | :ballot_box_with_check: | :ballot_box_with_check: | | |
| image | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: |
| image with given size | :ballot_box_with_check: | :ballot_box_with_check: | (:ballot_box_with_check: with `<img>`) | (:ballot_box_with_check: with `<img>`) |
| table of contents | :ballot_box_with_check: | :ballot_box_with_check: | | |
## Structural elements
| Feature | HFM 1 | HFM 2 | CommonMark | GFM |
|-------------------|:------------------------:|:------------------------:|:--------------------:|:--------------------:|
| table | :ballot_box_with_check: | :ballot_box_with_check: | (:ballot_box_with_check: with `<table>`) | :ballot_box_with_check: |
| horizontal line | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: |
| collapsable block | (:ballot_box_with_check: with `<details>`) | :ballot_box_with_check: | (:ballot_box_with_check: with `<details>`) | (:ballot_box_with_check: with `<details>`) |
| Alerts | :ballot_box_with_check: | :ballot_box_with_check: | | |
## 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 ... %}`) | :ballot_box_with_check: | removed | | |
| [YouTube][youtube] (`{%youtube ... %}`) | :ballot_box_with_check: | with plain link[^embed] | | |
| [Vimeo][vimeo] (`{%vimeo ... %}`) | :ballot_box_with_check: | with plain link[^embed] | | |
| [Slideshare][slideshare] (`{%slideshare ... %}`) | :ballot_box_with_check: | removed | | |
| [Speakerdeck][speakerdeck] (`{%speakerdeck ... %}`) | :ballot_box_with_check: | removed | | |
| [GitHub Gist][gist] (`{%gist ... %}`) | :ballot_box_with_check: | 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 | HFM 1 | HFM 2 | CommonMark | GFM |
|:-------------:|:--------------:|:--------------:|:----------:|:---:|
| `<title>` | | | :ballot_box_with_check: | |
| `<textarea>` | | :ballot_box_with_check: | :ballot_box_with_check: | |
| `<style>` | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: | |
| `<xmp>` | | | :ballot_box_with_check: | |
| `<iframe>` | :ballot_box_with_check: | :ballot_box_with_check: | :ballot_box_with_check: | |
| `<noembed>` | :ballot_box_with_check: | | :ballot_box_with_check: | |
| `<noframes>` | :ballot_box_with_check: | | :ballot_box_with_check: | |
| `<script>` | | | :ballot_box_with_check: | |
| `<plaintext>` | | :ballot_box_with_check: | :ballot_box_with_check: | |
[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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