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--- | ||
title: Markdown attributes | ||
description: Use mardown attributes to add HTML attributes when rendering markdown to HTML. | ||
categories: [content management] | ||
keywords: [goldmark,markdown] | ||
menu: | ||
docs: | ||
parent: content-management | ||
weight: 240 | ||
weight: 240 | ||
toc: true | ||
--- | ||
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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 | ||
This is a paragraph. | ||
{class="foo bar" id="baz"} | ||
``` | ||
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With `class` and `id` you can use shorthand notation: | ||
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```text | ||
This is a paragraph. | ||
{.foo .bar #baz} | ||
``` | ||
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Hugo renders both of these to: | ||
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```html | ||
<p class="foo bar" id="baz">This is a paragraph.</p> | ||
``` | ||
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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 >}} | ||
[markup.goldmark.parser.attribute] | ||
title = true # default is true | ||
block = true # default is false | ||
{{< /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/ | ||
[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 >}} | ||
[markup.goldmark.parser] | ||
wrapStandAloneImageWithinParagraph = false # default is true | ||
{{< /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 | ||
> This is a blockquote. | ||
{class="foo bar" hidden=hidden} | ||
``` | ||
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Hugo renders this to: | ||
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```html | ||
<blockquote class="foo bar" hidden="hidden"> | ||
<p>This is a blockquote.</p> | ||
</blockquote> | ||
``` | ||
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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 | ||
:--|:-- | ||
blockquote | bottom | ||
fenced code block | right | ||
heading | right | ||
horizontal rule | bottom | ||
image | bottom | ||
list | bottom | ||
paragraph | bottom | ||
table | bottom | ||
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For example: | ||
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````text | ||
## Section 1 {class=foo} | ||
```bash {class=foo linenos=inline} | ||
declare a=1 | ||
echo "${a}" | ||
``` | ||
This is a paragraph. | ||
{class=foo} | ||
```` | ||
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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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