DocFX Flavored Markdown

DocFX supports DocFX Flavored Markdown, aka DFM. It supports all GitHub Flavored Markdown syntax and compatible with CommonMark. Also, DFM adds new syntax to support additional functionalities, including cross reference and file inclusion.

NOTE

The default markdown engine generated by docfx init has been switched to markdig engine, which is built on the top of markdig. Previous markdown engine dfm and dfm-latest will be kept for compatibiilty.

Yaml Header

Yaml header in DFM is considered as the metadata for the Markdown file. It will transform to yamlheader tag when processed. Yaml header MUST be the first thing in the file and MUST take the form of valid YAML set between triple-dashed lines. Here is a basic example:

---
uid: A.md
title: A
---

Cross Reference

Cross reference allows you to link to another topic by using its unique identifier (called UID) instead of using its file path.

For conceptual Markdown files UID can be defined by adding a uid metadata in YAML header:

---
uid: uid_of_the_file
---

This is a conceptual topic with `uid` specified.

For reference topics, UIDs are auto generated from source code and can be found in generated YAML files.

You can use one of the following syntax to cross reference a topic with UID defined:

  1. Markdown link: [link_text](xref:uid_of_the_topic)
  2. Auto link: <xref:uid_of_the_topic>
  3. Shorthand form: @"uid_of_the_topic"

All will render to:

<a href="url_of_the_topic">link_text</a>

If link_text is not specified, DocFX will extract the title from the target topic and use it as the link text.

Do not use the @uid link in brackets (like this: (@uid)). DocFX cannot parse this link. The @uid link should be separated with white spaces. If you need to add a link in brackets, use [](xref:uid).

NOTE

Hashtag in xref is always treated as separator between file name and anchor name. That means if you have # in UID, it has to be encoded to %23.

Actually xref format follows URI standard so all reserved characters should be encoded.

For more information, see cross reference.

File Inclusion

DFM adds syntax to include other file parts into current file, the included file will also be considered as in DFM syntax.

There are two types of file inclusion: Inline and block, as similar to inline code span and block code.

NOTE

YAML header is NOT supported when the file is an inclusion.

Inline

Inline file inclusion is in the following syntax, in which <title> stands for the title of the included file, and <filepath> stands for the file path of the included file. The file path can be either absolute or relative.<filepath> can be wrapped by ' or ".

NOTE

For inline file inclusion, the file included will be considered as containing only inline tags, for example, ### header inside the file will not transfer since <h3> is a block tag, while [a](b) will transform to <a href='b'>a</a> since <a> is an inline tag. Also, ending white spaces will be trimmed, considering ending white spaces in inline inclusion in most cases are typos.

...Other inline contents... [!include[<title>](<filepath>)]

Block

Block file inclusion must be in a single line and with no prefix characters before the start [. Content inside the included file will transform using DFM syntax.

[!include[<title>](<filepath>)]

Section definition

User may need to define section. Mostly used for code table. Give an example below.

> [!div class="tabbedCodeSnippets" data-resources="OutlookServices.Calendar"]
> ```cs
> <cs code text>
> ```
> ```javascript
> <js code text>
> ```

The above blockquote Markdown text will transform to section html as in the following:

<div class="tabbedCodeSnippets" data-resources="OutlookServices.Calendar">
  <pre><code>cs code text</code></pre>
  <pre><code>js code text</code></pre>
</div>

Code Snippet

Allows you to insert code with code language specified. The content of specified code path will expand.

[!code-<language>[<name>](<codepath><queryoption><queryoptionvalue> "<title>")]
query string using # query string using ?
1. line range #L{startlinenumber}-L{endlinenumber} ?start={startlinenumber}&end={endlinenumber}
2. tagname #{tagname} ?name={tagname}
3. multiple region range Unsupported ?range={rangequerystring}
4. highlight lines Unsupported ?highlight={rangequerystring}
5. dedent Unsupported ?dedent={dedentlength}

Code Snippet Sample

[!code-csharp[Main](Program.cs)]

[!code[Main](Program.cs#L12-L16 "This is source file")]
[!code-vb[Main](../Application/Program.vb#testsnippet "This is source file")]

[!code[Main](index.xml?start=5&end=9)]
[!code-javascript[Main](../jquery.js?name=testsnippet)]
[!code[Main](index.xml?range=2,5-7,9-) "This includes the lines 2, 5, 6, 7 and lines 9 to the last line"]
[!code[Main](index.xml?highlight=2,5-7,9-) "This includes the whole file with lines 2,5-7,9- highlighted"]

Tag Name Representation in Code Snippet Source File

DFM currently supports the following <language> values to be able to retrieve by tag name:

NOTE

If dev-lang is not specified, file extension will be used to determine the language.

Code Snippet for Jupyter Notebooks

Allows you to insert code from a code cell of a Jupyter Notebook. The source content in the specified code cell will expand.

Steps to use this:

  1. In your Jupyter Notebook, add metadata to the code cell you will reference:

      "metadata": {
    "name": "{tagname}"
   }

  2. In your .md file, use name to identify the cell.

    [!notebook-<language>[](<codepath>?name={tagname})]]

Code Snippet for Jupyter Notebooks Sample

For this Jupyter Notebook cell:

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "name": "import"
   },
   "outputs": [],
   "source": [
    "import azureml.core\n",
    "print(azureml.core.VERSION)"
   ]
  },

Use the markup:

[!notebook-python[](<codepath>?name={import})]]

to display the lines of code in the source part of the cell:

import azureml.core
print(azureml.core.VERSION)

Note (Warning/Tip/Important)

Using specific syntax inside block quote to indicate the following content is Note.

> [!NOTE]
> <note content>
> [!WARNING]
> <warning content>

The above content will be transformed to the following html:

<div class="NOTE">
  <h5>NOTE</h5>
  <p>note content</p>
</div>
<div class="WARNING">
  <h5>WARNING</h5>
  <p>WARNING content</p>
</div>

Here are all the supported note types with the styling of the default theme applied:

NOTE

This is a note which needs your attention, but it's not super important.

TIP

This is a note which needs your attention, but it's not super important.

WARNING

This is a warning containing some important message.

IMPORTANT

This is a warning containing some important message.

CAUTION

This is a warning containing some important message.

Tabbed content

Syntax

Example

Tab group 1:

# [Tab Text 1](#tab/tabid-1)

Tab content-1-1.

# [Tab Text 2](#tab/tabid-2)

Tab content-2-1.

***

Tab group 2:

# [Tab Text A](#tab/tabid-a)

Tab content-a-1.

# [Tab Text B](#tab/tabid-b)

Tab content-b-1.

***

Tab group 3:

# [Tab Text 1](#tab/tabid-1)

Tab content-1-1.

# [Tab Text 2](#tab/tabid-2)

Tab content-2-1.

***

Tab group 4:

# [Tab Text A](#tab/tabid-a)

Tab content-a-2.

# [Tab Text B](#tab/tabid-b)

Tab content-b-2.

***

The result will be:

Tab group 1:

Tab content-1-1.

Tab group 2:

Tab content-a-1.

Tab group 3:

Tab content-1-1.

Tab group 4:

Tab content-a-2.

Behavior

Tab groups with a same set of id are linkable in one page.

In example, tab group 1, 3 have same id set: tabid-1, tabid-2, tab group 2, 4 have same id set: tabid-a, tabid-b.

So tab group 1, 3 are linked, tab group 2, 4 are linked. When tab tabid-1 in tab group 1 is clicked, tab tabid-1 in tab group 3 will be selected in same time. But tab group 2, 4 do not have any changed.

Condition

Condition is the tab id of other table groups.

e.g.:

Tab Group 1:

# [**Tab Text 1**](#tab/tabid-1)

Tab content-1.

# [**Tab Text 2**](#tab/tabid-2)

Tab content-2.

***

Tab Group 2:

# [Tab Text A](#tab/tabid-a/tabid-1)

Tab content-a for 1.

# [Tab Text A](#tab/tabid-a/tabid-2)

Tab content-a for 2.

# [Tab Text B](#tab/tabid-b/tabid-1)

Tab content-b for 1.

# [Tab Text B](#tab/tabid-b/tabid-2)

Tab content-b for 2.

***

Result:

Tab Group 1:

Tab content-1.

Tab Group 2:

Tab content-a for 1.

When select tabid-1 in tab group 1, you can get content-a or content-b for 1 in group 2.
When select tabid-2 in tab group 1, you can get content-a or content-b for 2 in group 2.

Video

Allows you to add videos to your topics.

Syntax:

> [!Video embed_link]
NOTE

You must provide the embed uri of the video you wish to add to your topic.

Example:

> [!Video https://www.youtube.com/embed/TAaG0nUUy6A]

Result:

Differences introduced by DFM syntax

WARNING

DFM introduces more syntax to support more functionalities. When GFM does not support them, preview the Markdown file inside GFM Preview can lead to different results.

YAML header

In GFM, YAML header must start at the very beginning of the Markdown file. In DFM, YAML header contains more powerful meanings. Refer to Yaml Header for details.

...some text...

---
a: b
---

In GFM, it would be rendered as <hr>a: b<hr>.
In DFM, it would be rendered as a YAML header.

If you want to get <hr> in html in DFM, use:

- - -
***
* * *

or change content to make it not in YAML format:

---
a\: b
---

Text after block extension

Some block extension in DFM cannot be recognized in GFM. In GFM, it would be treated as a part of paragraph. Then, following content would be treated as a part of paragraph.

For example:

> [!NOTE]
>     This is code.

In GFM, it will be rendered as a paragraph with content [!NOTE] This is code. in blockquote.
In DFM, it will be rendered as a code in note.