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# GitLab Markdown
This document is intended to be a comprehensive example of custom GitLab
Markdown usage. It will be parsed and then tested for accuracy. Let's get
started.
## Markdown
GitLab uses [Redcarpet](http://git.io/ld_NVQ) to parse all Markdown into
HTML.
It has some special features. Let's try 'em out!
### No Intra Emphasis
This string should have no emphasis: foo_bar_baz
### Tables
| Header | Row | Example |
| :------: | ---: | :------ |
| Foo | Bar | **Baz** |
### Fenced Code Blocks
```c
#include<stdio.h>
main()
{
printf("Hello World");
}
```
```python
print "Hello, World!"
```
### Strikethrough
This text says this, ~~and this text doesn't~~.
### Superscript
This is my 1^(st) time using superscript in Markdown. Now this is my
2^(nd).
### Next step
After the Markdown has been turned into HTML, it gets passed through...
## HTML::Pipeline
### SanitizationFilter
GitLab uses <a href="http://git.io/vfW8a">HTML::Pipeline::SanitizationFilter</a>
to sanitize the generated HTML, stripping dangerous or unwanted tags.
Its default whitelist is pretty permissive. Check it:
<b>b tag</b> and <em>em tag</em>.
<code>code tag</code>
Press <kbd>s</kbd> to search.
<strike>Emoji</strike> Plain old images! <img src="http://www.emoji-cheat-sheet.com/graphics/emojis/smile.png" width="20" height="20" />
Here comes a line break:
<br />
And a horizontal rule:
<hr />
As permissive as it is, we've allowed even more stuff:
<span>span tag</span>
<a href="#" rel="bookmark">This is a link with a defined rel attribute, which should be removed</a>
<a href="javascript:alert('Hi')">This is a link trying to be sneaky. It gets its link removed entirely.</a>
### Escaping
The problem with SanitizationFilter is that it can be too aggressive.
| Input | Expected | Actual |
| ----------- | ---------------- | --------- |
| `1 < 3 & 5` | 1 < 3 & 5 | 1 < 3 & 5 |
| `<foo>` | <foo> | <foo> |
### Edge Cases
Markdown should be usable inside a link. Let's try!
- [_text_](#link-emphasis)
- [**text**](#link-strong)
- [`text`](#link-code)
### RelativeLinkFilter
Linking to a file relative to this project's repository should work.
[Relative Link](doc/README.md)
### EmojiFilter
Because life would be :zzz: without Emoji, right? :rocket:
Get ready for the Emoji :bomb:: :+1::-1::ok_hand::wave::v::raised_hand::muscle:
### TableOfContentsFilter
All headers in this document should be linkable. Try it.
### AutolinkFilter
These are all plain text that should get turned into links:
- http://about.gitlab.com/
- https://google.com/
- ftp://ftp.us.debian.org/debian/
- smb://foo/bar/baz
- irc://irc.freenode.net/git
- http://localhost:3000
But it shouldn't autolink text inside certain tags:
- <code>http://code.gitlab.com/</code>
- <a>http://a.gitlab.com/</a>
- <kbd>http://kbd.gitlab.com/</kbd>
### ExternalLinkFilter
External links get a `rel="nofollow"` attribute:
- [Google](https://google.com/)
- [GitLab Root](<%= Gitlab.config.gitlab.url %>)
### Reference Filters (e.g., <%= issue.to_reference %>)
References should be parseable even inside _<%= merge_request.to_reference %>_ emphasis.
#### UserReferenceFilter
- All: @all
- User: <%= user.to_reference %>
- Group: <%= group.to_reference %>
- Ignores invalid: <%= User.reference_prefix %>fake_user
- Ignored in code: `<%= user.to_reference %>`
- Ignored in links: [Link to <%= user.to_reference %>](#user-link)
#### IssueReferenceFilter
- Issue: <%= issue.to_reference %>
- Issue in another project: <%= xissue.to_reference(project) %>
- Ignored in code: `<%= issue.to_reference %>`
- Ignored in links: [Link to <%= issue.to_reference %>](#issue-link)
#### MergeRequestReferenceFilter
- Merge request: <%= merge_request.to_reference %>
- Merge request in another project: <%= xmerge_request.to_reference(project) %>
- Ignored in code: `<%= merge_request.to_reference %>`
- Ignored in links: [Link to <%= merge_request.to_reference %>](#merge-request-link)
#### SnippetReferenceFilter
- Snippet: <%= snippet.to_reference %>
- Snippet in another project: <%= xsnippet.to_reference(project) %>
- Ignored in code: `<%= snippet.to_reference %>`
- Ignored in links: [Link to <%= snippet.to_reference %>](#snippet-link)
#### CommitRangeReferenceFilter
- Range: <%= commit_range.to_reference %>
- Range in another project: <%= xcommit_range.to_reference(project) %>
- Ignored in code: `<%= commit_range.to_reference %>`
- Ignored in links: [Link to <%= commit_range.to_reference %>](#commit-range-link)
#### CommitReferenceFilter
- Commit: <%= commit.to_reference %>
- Commit in another project: <%= xcommit.to_reference(project) %>
- Ignored in code: `<%= commit.to_reference %>`
- Ignored in links: [Link to <%= commit.to_reference %>](#commit-link)
#### LabelReferenceFilter
- Label by ID: <%= simple_label.to_reference %>
- Label by name: <%= Label.reference_prefix %><%= simple_label.name %>
- Label by name in quotes: <%= label.to_reference(:name) %>
- Ignored in code: `<%= simple_label.to_reference %>`
- Ignored in links: [Link to <%= simple_label.to_reference %>](#label-link)
### Task Lists
- [ ] Incomplete task 1
- [x] Complete task 1
- [ ] Incomplete task 2
- [ ] Incomplete sub-task 1
- [ ] Incomplete sub-task 2
- [x] Complete sub-task 1
- [X] Complete task 2
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