Features === **[English version](/features)** **[中文版](/TKNuhom7S62OV6bDyBglXA)** **[日本語版](/b_l4reliTdWOSn9SiCmbJQ)** **Do not modify this note.** Thank you very much :smile: **If you want to say hello or play with something, please go to [Playground](/SA8inq7VTmO8jIWC5QsMcw)** Introduction === <i class="fa fa-file-text"></i> **HackMD** is a realtime, multi-platform collaborative markdown note editor. This means that you can write notes with other people on your **desktop**, **tablet** or even on the **phone**. You can sign-in via multiple auth providers like **Facebook**, **Twitter**, **GitHub** and many more on the [_homepage_](/). Please report new issues in [GitHub](https://github.com/hackmdio/hackmd-io-issues/issues/new). If you need instant help, please send us a [Facebook message](https://www.messenger.com/t/hackmdio). **Thank you very much!** Workspace === ## Modes **Desktop & Tablet** <i class="fa fa-edit fa-fw"></i> Edit: See only the editor. <i class="fa fa-eye fa-fw"></i> View: See only the result. <i class="fa fa-columns fa-fw"></i> Both: See both in split view. **Mobile** <i class="fa fa-toggle-on fa-fw"></i> View: See only the result. <i class="fa fa-toggle-off fa-fw"></i> Edit: See only the editor. ## Image Upload: You can upload an image simply by clicking on the camera button <i class="fa fa-camera"></i>. Alternatively, you can **drag-n-drop** an image into the editor. Even **pasting** images is possible! This will automatically upload the image to **[imgur](http://imgur.com)**, nothing to worry. :tada: ![](https://i.imgur.com/9cgQVqD.png) ## Share Notes: If you want to share an **editable** note, just copy the URL. If you want to share a **read-only** note, simply press publish button <i class="fa fa-share-square-o"></i> and copy the URL. ## Save a Note: Currently, you can save to **Dropbox** <i class="fa fa-dropbox"></i> or save an `.md` file <i class="fa fa-file-text"></i> locally. ## Import Notes: Similarly to the _save_ feature, you can also import an `.md` file from **Dropbox** <i class="fa fa-dropbox"></i>, or import content from your **clipboard** <i class="fa fa-clipboard"></i>, and that can parse some **html** which might be useful :smiley: ## Permissions: It is possible to change the access permission to a note through the little button on the top right of the view. There are six possible options: | |Owner read/write|Signed-in read|Signed-in write|Guest read|Guest write| |:-----------------------------|:--------------:|:------------:|:-------------:|:--------:|:---------:| |<span class="text-nowrap"><i class="fa fa-leaf fa-fw"></i> **Freely**</span> |✔|✔|✔|✔|✔| |<span class="text-nowrap"><i class="fa fa-pencil fa-fw"></i> **Editable**</span> |✔|✔|✔|✔|✖| |<span class="text-nowrap"><i class="fa fa-id-card fa-fw"></i> **Limited**</span> |✔|✔|✔|✖|✖| |<span class="text-nowrap"><i class="fa fa-lock fa-fw"></i> **Locked**</span> |✔|✔|✖|✔|✖| |<span class="text-nowrap"><i class="fa fa-umbrella fa-fw"></i> **Protected**</span> |✔|✔|✖|✖|✖| |<span class="text-nowrap"><i class="fa fa-hand-stop-o fa-fw"></i> **Private**</span> |✔|✖|✖|✖|✖| **Only the owner of the note can change the note's permissions.** ## Embed a Note: Notes can be embedded as follows: ```xml <iframe width="100%" height="500" src="https://hackmd.io/features" frameborder="0"></iframe> ``` ## [Slide Mode](/slide-example): You can use a special syntax to organize your note into slides. After that, you can use the **Slide Mode** <i class="fa fa-tv"></i> to make a presentation. Visit the above link for details. ## [Book Mode](/book-example): You can make your notes into a book. List your links in order or nest them. Then use the **Book Mode** <i class="fa fa-book"></i> to make a collection. Visit the above link for details. View === ## Table of Contents: You can look at the bottom right section of the view area, there is a _ToC_ button <i class="fa fa-bars"></i>. Pressing that button will show you a current _Table of Contents_, and will highlight which section you're at. ToCs support up to **three header levels**. ## Permalink Every header will automatically add a permalink on the right side. You can hover and click <i class="fa fa-chain"></i> to anchor on it. Edit: === ## Shortcut Keys: Just like Sublime text, which is pretty quick and convenient. > For more infomation, see [here](https://codemirror.net/demo/sublime.html). ## Auto-Complete: This editor provides full auto-complete hints in markdown. - Emojis: type `:` to show hints. - Code blocks: type ` ``` ` and plus a character to show hint. <i hidden>```</i> - 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 as follows, the specified tags will show in your **history**. ###### tags: `features` `cool` `updated` ## [YAML Metadata](/yaml-metadata) You can provide advanced note information to set the browser behavior (visit above link for details): - title: set note title - description: set note description - image: set note default image (for link preview) - tags: set note tags - robots: set web robots meta - lang: set browser language - dir: set text direction - breaks: set to use line breaks - GA: set to use Google Analytics - disqus: set to use Disqus - slideOptions: setup slide mode options ## ToC: Use the syntax `[TOC]` to embed table of content into your note. [TOC] ## Emoji You can type any emoji like this :smile: :smiley: :cry: :wink: > See full emoji list [here](http://www.emoji-cheat-sheet.com/). ## ToDo List: - [ ] ToDos - [x] Buy some salad - [ ] Brush teeth - [x] Drink some water ## Code Block: We support many programming languages, use the auto complete function to see the entire list. ```javascript= 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 specifying the code block languagues. > Also, you can specify the start line number. > Like below, the line number starts from 101: ```javascript=101 var s = "JavaScript syntax highlighting"; alert(s); function $initHighlight(block, cls) { try { if (cls.search(/\bno\-highlight\b/) != -1) return process(block, true, 0x0F) + ' class=""'; } catch (e) { /* handle exception */ } for (var i = 0 / 2; i < classes.length; i++) { if (checkCondition(classes[i]) === undefined) return /\d+[\s/]/g; } } ``` > Or you might want to continue the previous code block's line number, use `=+` ```javascript=+ var s = "JavaScript syntax highlighting"; alert(s); ``` > Somtimes you have a super long text without breaks. It's time to use `!` to wrap your code. ```! When you’re a carpenter making a beautiful chest of drawers, you’re not going to use a piece of plywood on the back. ``` ### Blockquote Tags: > Using the syntax below to specifiy your **name, time and color** to vary the blockquotes. > [name=ChengHan Wu] [time=Sun, Jun 28, 2015 9:59 PM] [color=#907bf7] > > Even support the nest blockquotes! > > [name=ChengHan Wu] [time=Sun, Jun 28, 2015 10:00 PM] [color=red] ## Externals ### YouTube {%youtube 1G4isv_Fylg %} ### Vimeo {%vimeo 124148255 %} ### Gist {%gist schacon/4277%} ### SlideShare {%slideshare briansolis/26-disruptive-technology-trends-2016-2018-56796196 %} ### Speakerdeck {%speakerdeck sugarenia/xxlcss-how-to-scale-css-and-keep-your-sanity %} ### PDF **Caution: this might be blocked by your browser if not using an `https` URL.** {%pdf https://papers.nips.cc/paper/5346-sequence-to-sequence-learning-with-neural-networks.pdf %} ## MathJax You can render *LaTeX* mathematical expressions using **MathJax**, as on [math.stackexchange.com](http://math.stackexchange.com/), except the space after the start `$` and the space before the end `$` are not allowed in the inline math: 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](http://meta.math.stackexchange.com/questions/5020/mathjax-basic-tutorial-and-quick-reference). ## UML Diagrams ### Sequence Diagrams You can render sequence diagrams like this: ```sequence 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 Flow charts can be specified like this: ```flow 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 ```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 } ``` ### Mermaid ```mermaid gantt title A Gantt Diagram section Section A task :a1, 2014-01-01, 30d Another task :after a1 , 20d section Another Task in sec :2014-01-12 , 12d anther task : 24d ``` ### Abc ```abc X:1 T:Speed the Plough M:4/4 C:Trad. K:G |:GABc dedB|dedB dedB|c2ec B2dB|c2A2 A2BA| GABc dedB|dedB dedB|c2ec B2dB|A2F2 G4:| |:g2gf gdBd|g2f2 e2d2|c2ec B2dB|c2A2 A2df| g2gf g2Bd|g2f2 e2d2|c2ec B2dB|A2F2 G4:| ``` > More information about **sequence diagrams** syntax [here](http://bramp.github.io/js-sequence-diagrams/). > More information about **flow charts** syntax [here](http://adrai.github.io/flowchart.js/). > More information about **graphviz** syntax [here](http://www.tonyballantyne.com/graphs.html) > More information about **mermaid** syntax [here](http://knsv.github.io/mermaid) > More information about **abc** syntax [here](http://abcnotation.com/learn) Alert Area --- :::success Yes :tada: ::: :::info This is a message :mega: ::: :::warning Watch out :zap: ::: :::danger Oh No! :fire: ::: :::spoiler Click to show details You found me :stuck_out_tongue_winking_eye: ::: ## 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~~ lu~lala~ Superscript: 19^th^ Subscript: H~2~O ++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 1. You can use sequential numbers... 1. ...or keep all the numbers as `1.` 1. feafw 2. 332 3. 242 4. 2552 1. e2 Start numbering with offset: 57. foo 1. 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 ``` js 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](http://dev.nodeca.com) [link with title](http://nodeca.github.io/pica/demo/ "title text!") Autoconverted link https://github.com/nodeca/pica ### Images ![Minion](https://octodex.github.com/images/minion.png) ![Stormtroopocat](https://octodex.github.com/images/stormtroopocat.jpg "The Stormtroopocat") Like links, Images also have a footnote style syntax ![Alt text][id] With a reference later in the document defining the URL location: [id]: https://octodex.github.com/images/dojocat.jpg "The Dojocat" ![Minion](https://octodex.github.com/images/minion.png =200x200) Show the image with given size ### Footnotes Footnote 1 link[^first]. Footnote 2 link[^second]. Inline footnote^[Text of inline footnote] definition. Duplicated footnote reference[^second]. [^first]: Footnote **can have markup** and multiple paragraphs. [^second]: Footnote text. ### 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 an HTML abbreviation example. It converts "HTML", but keeps intact partial entries like "xxxHTMLyyy" and so on. *[HTML]: Hyper Text Markup Language