# Markdown Extensions
## Header Anchors
Headers automatically get anchor links applied. Rendering of anchors can be configured using the `markdown.anchor` option.
## Links
### Internal Links
Internal links are converted to router link for SPA navigation. Also, every `index.md` contained in each sub-directory will automatically be converted to `index.html`, with corresponding URL `/`.
For example, given the following directory structure:
```
.
├─ index.md
├─ foo
│ ├─ index.md
│ ├─ one.md
│ └─ two.md
└─ bar
├─ index.md
├─ three.md
└─ four.md
```
And providing you are in `foo/one.md`:
```md
[Home](/)
[foo](/foo/)
[foo heading](./#heading)
[bar - three](../bar/three)
[bar - three](../bar/three.md)
[bar - four](../bar/four.html)
```
### Page Suffix
Pages and internal links get generated with the `.html` suffix by default.
### External Links
Outbound links automatically get `target="_blank" rel="noopener noreferrer"`:
- [vuejs.org](https://vuejs.org)
- [VitePress on GitHub](https://github.com/vuejs/vitepress)
## Frontmatter
[YAML frontmatter](https://jekyllrb.com/docs/frontmatter/) is supported out of the box:
```yaml
---
title: Blogging Like a Hacker
lang: en-US
---
```
This data will be available to the rest of the page, along with all custom and theming components.
## GitHub-Style Tables
**Input**
```
| Tables | Are | Cool |
| ------------- |:-------------:| -----:|
| col 3 is | right-aligned | $1600 |
| col 2 is | centered | $12 |
| zebra stripes | are neat | $1 |
```
**Output**
| Tables | Are | Cool |
| ------------- | :-----------: | -----: |
| col 3 is | right-aligned | \$1600 |
| col 2 is | centered | \$12 |
| zebra stripes | are neat | \$1 |
## Emoji :tada:
**Input**
```
:tada: :100:
```
**Output**
:tada: :100:
A [list of all emojis](https://github.com/markdown-it/markdown-it-emoji/blob/master/lib/data/full.json) is available.
## Table of Contents
**Input**
```
[[toc]]
```
**Output**
[[toc]]
Rendering of the TOC can be configured using the `markdown.toc` option.
## Custom Containers
Custom containers can be defined by their types, titles, and contents.
### Default Title
**Input**
```md
::: tip
This is a tip
:::
::: warning
This is a warning
:::
::: danger
This is a dangerous warning
:::
```
**Output**
::: tip
This is a tip
:::
::: warning
This is a warning
:::
::: danger
This is a dangerous warning
:::
### Custom Title
**Input**
```md
::: danger STOP
Danger zone, do not proceed
:::
```
**Output**
::: danger STOP
Danger zone, do not proceed
:::
## Syntax Highlighting in Code Blocks
VitePress uses [Prism](https://prismjs.com/) to highlight language syntax in Markdown code blocks, using coloured text. Prism supports a wide variety of programming languages. All you need to do is append a valid language alias to the beginning backticks for the code block:
**Input**
````
```js
export default {
name: 'MyComponent',
// ...
}
```
````
**Output**
```js
export default {
name: 'MyComponent'
// ...
}
```
**Input**
````
```html
{{ todo.text }}
```
````
**Output**
```html
{{ todo.text }}
```
A [list of valid languages](https://prismjs.com/#languages-list) is available on Prism’s site.
## Line Highlighting in Code Blocks
**Input**
````
```js{4}
export default {
data () {
return {
msg: 'Highlighted!'
}
}
}
```
````
**Output**
```js{4}
export default {
data () {
return {
msg: 'Highlighted!'
}
}
}
```
In addition to a single line, you can also specify multiple single lines, ranges, or both:
- Line ranges: for example `{5-8}`, `{3-10}`, `{10-17}`
- Multiple single lines: for example `{4,7,9}`
- Line ranges and single lines: for example `{4,7-13,16,23-27,40}`
**Input**
````
```js{1,4,6-7}
export default { // Highlighted
data () {
return {
msg: `Highlighted!
This line isn't highlighted,
but this and the next 2 are.`,
motd: 'VitePress is awesome',
lorem: 'ipsum',
}
}
}
```
````
**Output**
```js{1,4,6-8}
export default { // Highlighted
data () {
return {
msg: `Highlighted!
This line isn't highlighted,
but this and the next 2 are.`,
motd: 'VitePress is awesome',
lorem: 'ipsum',
}
}
}
```
## Line Numbers
You can enable line numbers for each code blocks via config:
```js
module.exports = {
markdown: {
lineNumbers: true
}
}
```
- Demo:
## Advanced Configuration
VitePress uses [markdown-it](https://github.com/markdown-it/markdown-it) as the Markdown renderer. A lot of the extensions above are implemented via custom plugins. You can further customize the `markdown-it` instance using the `markdown` option in `.vitepress/config.js`:
```js
module.exports = {
markdown: {
// options for markdown-it-anchor
anchor: { permalink: false },
// options for markdown-it-toc
toc: { includeLevel: [1, 2] },
config: (md) => {
// use more markdown-it plugins!
md.use(require('markdown-it-xxx'))
}
}
}
```
