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108 lines
3.6 KiB
Markdown
108 lines
3.6 KiB
Markdown
# Frequently Asked Questions
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This page collects Frequently Asked Questions of the community.
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If you have any questions that aren't answered here, feel free to ask on our
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[community forums][hedgedoc-community] or in out [Matrix chat][matrix.org-url].
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[matrix.org-url]: https://chat.hedgedoc.org
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[hedgedoc-community]: https://community.hedgedoc.org
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## Why did you switch from MathJax to KaTeX?
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The new react frontend, that was introduced with HedgeDoc 2.0 switched from MathJax 2
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to [KaTeX][katex], because:
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- [KaTeX is much faster than MathJax](https://www.intmath.com/cg5/katex-mathjax-comparison.php?processor=MathJax )
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- [The MathJax React Component is not maintained and doesn't support MathJax 3](https://github.com/wko27/react-mathjax)
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- [KaTeX supports every command you'll need for math expressions](https://katex.org/docs/supported.html)
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[katex]: https://katex.org/
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## Why are code-blocks with 'sequence' as language deprecated?
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Starting with HedgeDoc 2.0, mermaid is used for rendering sequence-diagrams.
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The [syntax][mermaid-syntax] doesn't change. To remove the deprecation warning, simply change the
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codeblock-"language" from `sequence` to `mermaid` and insert a single line with `sequenceDiagram`
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just before your diagram content.
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**Deprecated**:
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```sequence
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Alice->>John: Hello John, how are you?
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John-->>Alice: Great!
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```
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**New**:
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```mermaid
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sequenceDiagram
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Alice->>John: Hello John, how are you?
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John-->>Alice: Great!
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```
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[mermaid-syntax]: https://mermaid-js.github.io/mermaid/#/sequenceDiagram
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## Why do tags in headings don't work anymore?
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Starting with HedgeDoc 2.0, we don't support tag headings in the note anymore.
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```markdown
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#### tags: `tag1`, `tag2`
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```
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Instead, please use the [frontmatter metadata][frontmatter] to specify tags.
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[frontmatter]: https://demo.hedgedoc.org/yaml-metadata#tags
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## Why is the comma separated definition of tags in the YAML-metadata deprecated?
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[YAML already has a definition for lists](https://yaml.org/spec/1.2/spec.html#id2759963).
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Therefore, we don't see any reason to maintain another way to define a list.
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<!-- markdownlint-disable no-emphasis-as-heading -->
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**Deprecated**
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<!-- markdownlint-enable no-emphasis-as-heading -->
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```yaml
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tags: tag1, tag2
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```
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<!-- markdownlint-disable no-emphasis-as-heading -->
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**New**
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<!-- markdownlint-enable no-emphasis-as-heading -->
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```yaml
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tags:
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- tag1
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- tag2
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```
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<!-- markdownlint-disable no-emphasis-as-heading -->
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*or*
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<!-- markdownlint-enable no-emphasis-as-heading -->
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```yaml
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tags: ['tag1', 'tag2']
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```
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## Why should I want to run my renderer on a different (sub-)domain?
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If the renderer is provided by another domain, it's way harder to manipulate HedgeDoc or
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steal credentials from the rendered note content, because renderer and editor are more isolated.
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This increases the security of the software and greatly mitigates [XSS attacks][xss].
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However, you can run HedgeDoc without this extra security, but we recommend using it if possible.
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!!! note
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When you want to use a separate domain for `HD_RENDERER_BASE_URL`, your reverse proxy config
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needs to be adjusted to direct requests for this domain to the frontend.
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[xss]: https://en.wikipedia.org/wiki/Cross-site_scripting
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## Why are forkawesome icons deprecated?
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As forkawesome icons are not really well maintained, we decided to replace them with
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[bootstrap icons][bootstrap-icons]. To keep the compatibility with HedgeDoc 1 notes
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we still import them, but will likely remove those icons at some point. So your
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best take of action is replacing these icons with [bootstrap icons][bootstrap-icons].
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[bootstrap-icons]: https://icons.getbootstrap.com/
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