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diff --git a/docs/content/references/hfm.md b/docs/content/references/hfm.md new file mode 100644 index 00000000..271d7cd3 --- /dev/null +++ b/docs/content/references/hfm.md @@ -0,0 +1,116 @@ +# 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 | ☑️ | ☑️ | ☑️ | ☑️ | +| 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/ |