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115 lines
3.1 KiB
Markdown
115 lines
3.1 KiB
Markdown
---
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title: Markdown attributes
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description: Use Markdown attributes to add HTML attributes when rendering Markdown to HTML.
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categories: [content management]
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keywords: [goldmark,markdown]
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menu:
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docs:
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parent: content-management
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weight: 240
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weight: 240
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toc: true
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---
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## Overview
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Hugo supports Markdown attributes on images and block elements including blockquotes, fenced code blocks, headings, horizontal rules, lists, paragraphs, and tables.
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For example:
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```text
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This is a paragraph.
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{class="foo bar" id="baz"}
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```
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With `class` and `id` you can use shorthand notation:
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```text
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This is a paragraph.
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{.foo .bar #baz}
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```
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Hugo renders both of these to:
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```html
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<p class="foo bar" id="baz">This is a paragraph.</p>
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```
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## Block elements
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Update your site configuration to enable Markdown attributes for block-level elements.
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{{< code-toggle file=hugo >}}
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[markup.goldmark.parser.attribute]
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title = true # default is true
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block = true # default is false
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{{< /code-toggle >}}
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## Standalone images
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By default, when the [Goldmark] Markdown renderer encounters a standalone image element (no other elements or text on the same line), it wraps the image element within a paragraph element per the [CommonMark specification].
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[CommonMark specification]: https://spec.commonmark.org/current/
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[Goldmark]: https://github.com/yuin/goldmark
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If you were to place an attribute list beneath an image element, Hugo would apply the attributes to the surrounding paragraph, not the image.
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To apply attributes to a standalone image element, you must disable the default wrapping behavior:
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{{< code-toggle file=hugo >}}
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[markup.goldmark.parser]
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wrapStandAloneImageWithinParagraph = false # default is true
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{{< /code-toggle >}}
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## Usage
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You may add [global HTML attributes], or HTML attributes specific to the current element type. Consistent with its content security model, Hugo removes HTML event attributes such as `onclick` and `onmouseover`.
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[global HTML attributes]: https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes
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The attribute list consists of one or more key-value pairs, separated by spaces or commas, wrapped by braces. You must quote string values that contain spaces. Unlike HTML, boolean attributes must have both key and value.
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For example:
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```text
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> This is a blockquote.
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{class="foo bar" hidden=hidden}
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```
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Hugo renders this to:
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```html
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<blockquote class="foo bar" hidden="hidden">
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<p>This is a blockquote.</p>
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</blockquote>
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```
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In most cases, place the attribute list beneath the markup element. For headings and fenced code blocks, place the attribute list on the right.
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Element|Position of attribute list
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:--|:--
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blockquote | bottom
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fenced code block | right
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heading | right
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horizontal rule | bottom
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image | bottom
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list | bottom
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paragraph | bottom
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table | bottom
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For example:
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````text
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## Section 1 {class=foo}
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```bash {class=foo linenos=inline}
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declare a=1
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echo "${a}"
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```
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This is a paragraph.
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{class=foo}
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````
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As shown above, the attribute list for fenced code blocks is not limited to HTML attributes. You can also configure syntax highlighting by passing one or more of [these options](/functions/transform/highlight/#options).
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