A marked extension to support GFM footnotes.
You can install marked-footnote using npm or yarn:
npm i marked-footnote
# or
yarn add marked-footnoteOnce you've installed this extension, you can use it in your marked configuration. Here's an example of how to configure it:
Say we have the following file example.html:
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Marked Footnote</title>
<link
rel="stylesheet"
href="https://cdnjs.cloudflare.com/ajax/libs/github-markdown-css/5.2.0/github-markdown-light.min.css"
integrity="sha512-bm684OXnsiNuQSyrxuuwo4PHqr3OzxPpXyhT66DA/fhl73e1JmBxRKGnO/nRwWvOZxJLRCmNH7FII+Yn1JNPmg=="
crossorigin="anonymous"
referrerpolicy="no-referrer"
/>
<style>
#content {
margin: 0 auto;
padding: 1rem;
max-width: 928px;
}
.sr-only {
position: absolute;
width: 1px;
height: 1px;
padding: 0;
overflow: hidden;
clip: rect(0, 0, 0, 0);
word-wrap: normal;
border: 0;
}
</style>
</head>
<body class="markdown-body">
<div id="content"></div>
<script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/marked-footnote/dist/index.umd.min.js"></script>
<script>
const md = `# Example
[^1]: This is a footnote content.
Here is a simple footnote[^1]. With some additional text after it[^@#$%] and without disrupting the blocks[^bignote].
[^bignote]: The first paragraph of the definition.
Paragraph two of the definition.
> A blockquote with
> multiple lines.
~~~
a code block
~~~
| Header 1 | Header 2 |
| -------- | -------- |
| Cell 1 | Cell 2 |
A \`final\` paragraph before list.
- Item 1
- Item 2
- Subitem 1
- Subitem 2
[^@#$%]: A footnote on the label: "@#$%".
`
document.getElementById('content').innerHTML = new marked.Marked()
.use(markedFootnote())
.parse(md)
</script>
</body>
</html>
Say we have the following file example.md:
# Example
[^1]: This is a footnote content.
Here is a simple footnote[^1]. With some additional text after it[^@#$%] and without disrupting the blocks[^bignote].
[^bignote]: The first paragraph of the definition.
Paragraph two of the definition.
> A blockquote with
> multiple lines.
```
a code block
```
| Header 1 | Header 2 |
| -------- | -------- |
| Cell 1 | Cell 2 |
A `final` paragraph before list.
- Item 1
- Item 2
- Subitem 1
- Subitem 2
[^@#$%]: A footnote on the label: "@#$%".Note: The position of a footnote in your Markdown does not influence where the footnote will be rendered. You can write a footnote right after your reference to the footnote, and the footnote will still render at the bottom of the Markdown.
And our module example.js looks as follows:
import { readFileSync } from 'node:fs'
import { Marked } from 'marked'
import markedFootnote from 'marked-footnote'
const html = new Marked()
.use(markedFootnote())
.parse(readFileSync('example.md', 'utf8'))
console.log(html)Now, running node example.js yields:
<h1>Example</h1>
<p>
Here is a simple footnote<sup
><a
id="footnote-ref-1"
href="#footnote-1"
data-footnote-ref
aria-describedby="footnote-label"
>1</a
></sup
>. With some additional text after it<sup
><a
id="footnote-ref-%40%23%24%25"
href="#footnote-%40%23%24%25"
data-footnote-ref
aria-describedby="footnote-label"
>2</a
></sup
>
and without disrupting the blocks<sup
><a
id="footnote-ref-bignote"
href="#footnote-bignote"
data-footnote-ref
aria-describedby="footnote-label"
>3</a
></sup
>.
</p>
<section class="footnotes" data-footnotes>
<h2 id="footnote-label" class="sr-only">Footnotes</h2>
<ol>
<li id="footnote-1">
<p>
This is a footnote content.
<a
href="#footnote-ref-1"
data-footnote-backref
aria-label="Back to reference 1"
>↩</a
>
</p>
</li>
<li id="footnote-%40%23%24%25">
<p>
A footnote on the label: "@#$%".
<a
href="#footnote-ref-%40%23%24%25"
data-footnote-backref
aria-label="Back to reference @#$%"
>↩</a
>
</p>
</li>
<li id="footnote-bignote">
<p>The first paragraph of the definition.</p>
<p>Paragraph two of the definition.</p>
<blockquote>
<p>A blockquote with multiple lines.</p>
</blockquote>
<pre><code>a code block
</code></pre>
<table>
<thead>
<tr>
<th>Header 1</th>
<th>Header 2</th>
</tr>
</thead>
<tbody>
<tr>
<td>Cell 1</td>
<td>Cell 2</td>
</tr>
</tbody>
</table>
<p>A <code>final</code> paragraph before list.</p>
<ul>
<li>Item 1</li>
<li>
Item 2
<ul>
<li>Subitem 1</li>
<li>Subitem 2</li>
</ul>
</li>
</ul>
<a
href="#footnote-ref-bignote"
data-footnote-backref
aria-label="Back to reference bignote"
>↩</a
>
</li>
</ol>
</section>By default, this plugin does not place footnote markers in square brackets ([1]), instead like this: 1. So you will need to add the style as shown below to your CSS:
[data-footnote-ref]::before {
content: '[';
}
[data-footnote-ref]::after {
content: ']';
}The marked-footnote extension accepts the following configuration options:
-
prefixId: The prefix ID for footnotes. Defaults to'footnote-'. -
description: The description of footnotes, used byaria-labeledbyattribute. Defaults to'Footnotes'. -
refMarkers: If set totrue, it will place footnote reference in square brackets, like this:[1]. Defaults tofalse.
When considering the use of footnotes in your content, it's important to keep in mind the following accessibility and usability factors:
- Screen Reader Compatibility: Screen readers may not effectively convey footnotes. They tend to read the footnote number without indicating that it's a footnote or using superscript. Additionally, they may not identify the link to the footnote text.
- Accessibility Challenges: Footnotes pose challenges for all users on a web page. To access them, one often needs to scroll to the end of the page, read the footnote, and then click back to the main content. Not everyone is aware that they should click on the footnote at the end, potentially causing them to lose their place. Moreover, if the same footnote is repeated multiple times, clicking on the link could lead to the wrong location.
See extensions list.
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