hugo/content/en/getting-started/configuration-markup.md

title	description	date	categories	keywords	weight	sections_weight	slug	toc
Configure Markup	How to handle Markdown and other markup related configuration.	2019-11-15	getting started fundamentals	configuration highlighting	65	65	configuration-markup	true

Configure Markup

{{< new-in "0.60.0" >}}

See Goldmark for settings related to the default Markdown handler in Hugo.

Below are all markup related configuration in Hugo with their default settings:

{{< code-toggle config="markup" />}}

See each section below for details.

Goldmark

Goldmark is from Hugo 0.60 the default library used for Markdown. It's fast, it's CommonMark compliant and it's very flexible. Note that the feature set of Goldmark vs Blackfriday isn't the same; you gain a lot but also lose some, but we will work to bridge any gap in the upcoming Hugo versions.

This is the default configuration:

{{< code-toggle config="markup.goldmark" />}}

For details on the extensions, refer to this section of the Goldmark documentation

Some settings explained:

unsafe

By default, Goldmark does not render raw HTMLs and potentially dangerous links. If you have lots of inline HTML and/or JavaScript, you may need to turn this on.

typographer

This extension substitutes punctuations with typographic entities like smartypants.

attribute

Enable custom attribute support for titles and blocks by adding attribute lists inside single curly brackets ({.myclass class="class1 class2" }) and placing it after the Markdown element it decorates, on the same line for titles and on a new line directly below for blocks.

{{< new-in "0.81.0" >}} In Hugo 0.81.0 we added support for adding attributes (e.g. CSS classes) to Markdown blocks, e.g. tables, lists, paragraphs etc.

A blockquote with a CSS class:

> foo
> bar
{.myclass}

There are some current limitations: For tables you can currently only apply it to the full table, and for lists the ul/ol-nodes only, e.g.:

* Fruit
  * Apple
  * Orange
  * Banana
  {.fruits}
* Dairy
  * Milk
  * Cheese
  {.dairies}
{.list}

Note that attributes in code fences must come after the opening tag, with any other highlighting processing instruction, e.g.:

```go {.myclass linenos=table,hl_lines=[8,"15-17"],linenostart=199}
// ... code
```

autoHeadingIDType ("github") {{< new-in "0.62.2" >}}

The strategy used for creating auto IDs (anchor names). Available types are github, github-ascii and blackfriday. github produces GitHub-compatible IDs, github-ascii will drop any non-Ascii characters after accent normalization, and blackfriday will make the IDs work as with Blackfriday, the default Markdown engine before Hugo 0.60. Note that if Goldmark is your default Markdown engine, this is also the strategy used in the anchorize template func.

Blackfriday

Blackfriday was Hugo's default Markdown rendering engine, now replaced with Goldmark. But you can still use it: Just set defaultMarkdownHandler to blackfriday in your top level markup config.

This is the default config:

{{< code-toggle config="markup.blackFriday" />}}

Highlight

This is the default highlight configuration. Note that some of these settings can be set per code block, see Syntax Highlighting.

{{< code-toggle config="markup.highlight" />}}

For style, see these galleries:

• Short snippets
• Long snippets

For CSS, see Generate Syntax Highlighter CSS.

Table Of Contents

{{< code-toggle config="markup.tableOfContents" />}}

These settings only works for the Goldmark renderer:

startLevel

The heading level, values starting at 1 (h1), to start render the table of contents.

endLevel

The heading level, inclusive, to stop render the table of contents.

ordered

Whether or not to generate an ordered list instead of an unordered list.

Markdown Render Hooks

{{< new-in "0.62.0" >}}

Note that this is only supported with the Goldmark renderer.

Render Hooks allow custom templates to override markdown rendering functionality. You can do this by creating templates with base names render-{feature} in layouts/_default/_markup.

You can also create type/section specific hooks in layouts/[type/section]/_markup, e.g.: layouts/blog/_markup.{{< new-in "0.71.0" >}}

The features currently supported are:

• image
• link
• heading {{< new-in "0.71.0" >}}

You can define Output-Format- and language-specific templates if needed. Your layouts folder may look like this:

layouts
└── _default
    └── _markup
        ├── render-image.html
        ├── render-image.rss.xml
        └── render-link.html

Some use cases for the above:

• Resolve link references using .GetPage. This would make links portable as you could translate ./my-post.md (and similar constructs that would work on GitHub) into /blog/2019/01/01/my-post/ etc.
• Add target=_blank to external links.
• Resolve and process images.
• Add header links.

Render Hook Templates

The render-link and render-image templates will receive this context:

Page

The Page being rendered.

Destination

The URL.

Title

The title attribute.

Text

The rendered (HTML) link text.

PlainText

The plain variant of the above.

The render-heading template will receive this context:

Page

The Page being rendered.

Level

The header level (1--6)

Anchor

An auto-generated html id unique to the header within the page

Text

The rendered (HTML) text.

PlainText

The plain variant of the above.

Attributes (map) {{< new-in "0.82.0" >}}

A map of attributes (e.g. id, class)

Link with title Markdown example:

[Text](https://www.gohugo.io "Title")

Here is a code example for how the render-link.html template could look:

{{< code file="layouts/_default/_markup/render-link.html" >}} <a href="{{ .Destination | safeURL }}"{{ with .Title}} title="{{ . }}"{{ end }}{{ if strings.HasPrefix .Destination "http" }} target="_blank" rel="noopener"{{ end }}>{{ .Text | safeHTML }} {{< /code >}}

Image Markdown example:

![Text](https://d33wubrfki0l68.cloudfront.net/c38c7334cc3f23585738e40334284fddcaf03d5e/2e17c/images/hugo-logo-wide.svg "Title")

Here is a code example for how the render-image.html template could look:

{{< code file="layouts/_default/_markup/render-image.html" >}}

{{< /code >}}

Heading link example

Given this template file

{{< code file="layouts/_default/_markup/render-heading.html" >}} <h{{ .Level }} id="{{ .Anchor | safeURL }}">{{ .Text | safeHTML }} ¶</h{{ .Level }}> {{< /code >}}

And this markdown

### Section A

The rendered html will be

<h3 id="section-a">Section A <a href="#section-a">¶</a></h3>