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Features

Introduction

HackMD is a realtime collaborate markdown note in all platforms. This mean you can do some notes with any other in Desktop, Tablet or even Phone. You can Sign in via Facebook, Twitter, GitHub, Dropbox in the homepage.

This service still in early stage, might be buggy or crash. Please report issue in GitHub. If you need instant help, please use Facebook Message. Thank you very much!

Workspace

Modes

Desktop & Tablet

Edit: See only the editor. View: See only the result. Both: See both in split view.

Mobile

View: See only the result. Edit: See only the editor.

Upload image

You can simply press the camera button . Or drag-n-drop image in editor, even paste image works! It will automatically upload to imgur, nothing to worry 🎉

Share note

If you want to share a editable note, just copy the url. If you want to share a read-only note, simply press share button and copy the url.

Save

Currently, you can save to dropbox or save as .md to local.

Import

Like save feature, you can also import .md from dropbox . Or import from your clipboard , and that can parse some html which might be useful 😃

Permission

There is a little button on the top right of the view. You can change the permission via theres options. It might be one of below:

Freely: Anyone can edit this note. Editable: Signed user can edit this note. Locked: Only owner can edit this note. Private: Only owner can view and edit this note.

Only the owner of the note can change the permission

Embed

<iframe width="100%" height="500" src="http://hackmd.io/features" frameborder="0"></iframe>

View

Table of content

You can look at bottom right place of the view area, there is a TOC button . Press that will show current table of content and will emphasis which your section on. Support up to three header levels.

Permalink

Every header will automatically add a permalink on the right side. You can hover and click to anchor on it.

Edit

Shortcut keys

Just like sublime text, which is pretty quick and convinent.

For more infomations, see here.

Auto complete

This editor provide full auto complete hint of markdown.

  • Emojis: type : to show hint.
  • Code blocks: type ``` and plus a character to show hint. ```
  • Headers: type # to show hint.
  • Referrals: type [] to show hint.
  • Externals: type {} to show hint.
  • Images: type ! to show hint.

Title

This will take the first level 1 header as the note title.

Tags

Using tags like below, these will show in your history.

tags: features cool updated

YAML metadata

Provide advanced note information to set the browse behavior, visit above link for detail

  • robots: set search engine to index or not
  • lang: set browse language
  • dir: set text direction
  • breaks: set to use line breaks

Emoji

You can type any emoji like this 😄 😃 😢 😉

See full emoji list here

Todo List

  • Todos
    • Buy some salad
    • Brush teeth
    • Drink some water

Code block

We support many code languages, use the auto complete to see the list.

var s = "JavaScript syntax highlighting";
alert(s);
function $initHighlight(block, cls) {
  try {
    if (cls.search(/\bno\-highlight\b/) != -1)
      return process(block, true, 0x0F) + 
             ' class=""';
  } catch (e) {
    /* handle exception */
  }
  for (var i = 0 / 2; i < classes.length; i++) {
    if (checkCondition(classes[i]) === undefined)
      return /\d+[\s/]/g;
  }
}

If you want line numbers, type = after specify the code block languagues. Also, you can specify the start line number. Like below, the line number starts from 101:

var s = "JavaScript syntax highlighting";
alert(s);
function $initHighlight(block, cls) {
  try {
    if (cls.search(/\bno\-highlight\b/) != -1)
      return process(block, true, 0x0F) + 
             ' class=""';
  } catch (e) {
    /* handle exception */
  }
  for (var i = 0 / 2; i < classes.length; i++) {
    if (checkCondition(classes[i]) === undefined)
      return /\d+[\s/]/g;
  }
}

Or you might want to continue the previous code block line number, use =+

var s = "JavaScript syntax highlighting";
alert(s);

Blockquotes tags

Using like below to specifiy your name, time and color to differ the blockquotes. [name=ChengHan Wu] [time=Sun, Jun 28, 2015 9:59 PM] [color=#907bf7]

Even support the nest blockquotes! [name=ChengHan Wu] [time=Sun, Jun 28, 2015 10:00 PM] [color=red]

Externals

Youtube

{%youtube 1G4isv_Fylg %}

Vimeo

{%vimeo 124148255 %}

Gist

{%gist schacon/4277%}

SlideShare

{%slideshare briansolis/26-disruptive-technology-trends-2016-2018-56796196 %}

Speakerdeck

{%speakerdeck sugarenia/xxlcss-how-to-scale-css-and-keep-your-sanity %}

MathJax

You can render LaTeX mathematical expressions using MathJax, as on math.stackexchange.com:

The Gamma function satisfying \Gamma(n) = (n-1)!\quad\forall n\in\mathbb N is via the Euler integral

x = {-b \pm \sqrt{b^2-4ac} \over 2a}.

\Gamma(z) = \int_0^\infty t^{z-1}e^{-t}dt,.

More information about LaTeX mathematical expressions here.

UML diagrams

Sequence diagrams

You can render sequence diagrams like this:

Alice->Bob: Hello Bob, how are you?
Note right of Bob: Bob thinks
Bob-->Alice: I am good thanks!
Note left of Alice: Alice responds
Alice->Bob: Where have you been?

Flow charts

And flow charts like this:

st=>start: Start
e=>end: End
op=>operation: My Operation
op2=>operation: lalala
cond=>condition: Yes or No?

st->op->op2->cond
cond(yes)->e
cond(no)->op2

Graphviz

digraph hierarchy {

                nodesep=1.0 // increases the separation between nodes
                
                node [color=Red,fontname=Courier,shape=box] //All nodes will this shape and colour
                edge [color=Blue, style=dashed] //All the lines look like this

                Headteacher->{Deputy1 Deputy2 BusinessManager}
                Deputy1->{Teacher1 Teacher2}
                BusinessManager->ITManager
                {rank=same;ITManager Teacher1 Teacher2}  // Put them on the same level
}

More information about Sequence diagrams syntax here. More information about Flow charts syntax here. More information about Graphviz syntax here

Typography

Headers

# h1 Heading
## h2 Heading
### h3 Heading
#### h4 Heading
##### h5 Heading
###### h6 Heading

Horizontal rules

Typographic replacements

Enable typographer option to see result.

(c) (C) (r) (R) (tm) (TM) (p) (P) +-

test.. test... test..... test?..... test!....

!!!!!! ???? ,,

Remarkable -- awesome

"Smartypants, double quotes"

'Smartypants, single quotes'

Emphasis

This is bold text

This is bold text

This is italic text

This is italic text

Deleted text

lulala

Superscript: 19^th^

Subscript: H2O

++Inserted text++

==Marked text==

Blockquotes

Blockquotes can also be nested...

...by using additional greater-than signs right next to each other...

...or with spaces between arrows.

Lists

Unordered

  • Create a list by starting a line with +, -, or *
  • Sub-lists are made by indenting 2 spaces:
    • Marker character change forces new list start:
      • Ac tristique libero volutpat at
      • Facilisis in pretium nisl aliquet
      • Nulla volutpat aliquam velit
  • Very easy!

Ordered

  1. Lorem ipsum dolor sit amet

  2. Consectetur adipiscing elit

  3. Integer molestie lorem at massa

  4. You can use sequential numbers...

  5. ...or keep all the numbers as 1.

  6. feafw

  7. 332

  8. 242

  9. 2552

  10. e2

Start numbering with offset:

  1. foo
  2. bar

Code

Inline code

Indented code

// Some comments
line 1 of code
line 2 of code
line 3 of code

Block code "fences"

Sample text here...

Syntax highlighting

var foo = function (bar) {
  return bar++;
};

console.log(foo(5));

Tables

Option Description
data path to data files to supply the data that will be passed into templates.
engine engine to be used for processing templates. Handlebars is the default.
ext extension to be used for dest files.

Right aligned columns

Option Description
data path to data files to supply the data that will be passed into templates.
engine engine to be used for processing templates. Handlebars is the default.
ext extension to be used for dest files.

Left aligned columns

Option Description
data path to data files to supply the data that will be passed into templates.
engine engine to be used for processing templates. Handlebars is the default.
ext extension to be used for dest files.

Center aligned columns

Option Description
data path to data files to supply the data that will be passed into templates.
engine engine to be used for processing templates. Handlebars is the default.
ext extension to be used for dest files.

Links

link text link with title Autoconverted link https://github.com/nodeca/pica

Images

Minion Stormtroopocat Like links, Images also have a footnote style syntax Alt text With a reference later in the document defining the URL location:

Footnotes

Footnote 1 link1. Footnote 2 link2. Inline footnote^[Text of inline footnote] definition. Duplicated footnote reference2.

Definition lists

Term 1

Definition 1

with lazy continuation.

Term 2 with inline markup

Definition 2

{ some code, part of Definition 2 }

Third paragraph of definition 2.

Compact style:

Term 1 ~ Definition 1

Term 2 ~ Definition 2a ~ Definition 2b

Abbreviations

This is HTML abbreviation example. It converts "HTML", but keep intact partial entries like "xxxHTMLyyy" and so on.

*[HTML]: Hyper Text Markup Language

  1. Footnote can have markup and multiple paragraphs. ↩︎

  2. Footnote text. ↩︎