diff --git a/docs/content/references/hfm.md b/docs/content/references/hfm.md
index c72746606..379fe0ef8 100644
--- a/docs/content/references/hfm.md
+++ b/docs/content/references/hfm.md
@@ -8,36 +8,36 @@ These tables tell you what exactly we support in HedgeDoc 1.x (HFM 1) and HedgeD
 ## 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>`) |
+| 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]                   |                      |                      |
+| 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 using syntax highlighting.
 [^extra-code]: Several special "language" keywords can be used for rendering diagrams, charts, etc.
@@ -47,56 +47,56 @@ These tables tell you what exactly we support in HedgeDoc 1.x (HFM 1) and HedgeD
 
 ## 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     | ☑️     | ☑️     |                  |                  |
+| 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            | ☑️                        | ☑️                        |                      |                      |
+| Feature           |        HFM 1         | HFM 2 |      CommonMark      |         GFM          |
+| ----------------- | :------------------: | :---: | :------------------: | :------------------: |
+| table             |          ☑️           |   ☑️   |  (☑️ with `<table>`)  |          ☑️           |
+| horizontal line   |          ☑️           |   ☑️   |          ☑️           |          ☑️           |
+| collapsable block | (☑️ with `<details>`) |   ☑️   | (☑️ with `<details>`) | (☑️ with `<details>`) |
+| Alerts            |          ☑️           |   ☑️   |                      |                      |
 
 ## Embeddings
 HFM 1 includes support for certain embeddings of external content by using the `{%keyword parameter %}` syntax. To increase the readability of the markdown code we decided that HFM 2 should just use plain links if possible.
 
-| 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] |            |     |
+| 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 from HFM 1 is deprecated, but will still work in HFM 2. However, a plain link to the content should be used.
 
 ## 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>` |                | ☑️              | ☑️          |     |
+|    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/