Arduino IDE in the Cloud. Codebender includes a Arduino web editor so you can code, store and manage your Arduino sketches on the cloud, and even compile and flash them. We would like to show you a description here but the site won’t allow us.

This page is a shameful copy of the great Grav original page.Only difference is information about image customization (resizing, add CSS classes…)

Let’s face it: Writing content for the Web is tiresome. WYSIWYG editors help alleviate this task, but they generally result in horrible code, or worse yet, ugly web pages.

Markdown is a better way to write HTML, without all the complexities and ugliness that usually accompanies it.

Some of the key benefits are:

1. Markdown is simple to learn, with minimal extra characters so it’s also quicker to write content.
2. Less chance of errors when writing in markdown.
3. Produces valid XHTML output.
4. Keeps the content and the visual display separate, so you cannot mess up the look of your site.
5. Write in any text editor or Markdown application you like.
6. Markdown is a joy to use!

John Gruber, the author of Markdown, puts it like this:

The overriding design goal for Markdown’s formatting syntax is to make it as readable as possible. The idea is that a Markdown-formatted document should be publishable as-is, as plain text, without looking like it’s been marked up with tags or formatting instructions. While Markdown’s syntax has been influenced by several existing text-to-HTML filters, the single biggest source of inspiration for Markdown’s syntax is the format of plain text email.– John Gruber

Grav ships with built-in support for Markdown and Markdown Extra. You must enable Markdown Extra in your system.yaml configuration file

Without further delay, let us go over the main elements of Markdown and what the resulting HTML looks like:

Headings

Headings from h1 through h6 are constructed with a # for each level:

Renders to:

h2 Heading

h3 Heading

h4 Heading

h5 Heading

h6 Heading

HTML:

Comments should be HTML compatible

Comment below should NOT be seen:

Horizontal Rules

The HTML <hr> element is for creating a “thematic break” between paragraph-level elements. In markdown, you can create a <hr> with any of the following:

• ___: three consecutive underscores
• ---: three consecutive dashes
• ***: three consecutive asterisks

renders to:

Body Copy

Body copy written as normal, plain text will be wrapped with <p></p> tags in the rendered HTML.

So this body copy:

renders to this HTML:

Emphasis

Bold

For emphasizing a snippet of text with a heavier font-weight.

The following snippet of text is rendered as bold text.

renders to:

rendered as bold text

and this HTML

Italics

For emphasizing a snippet of text with italics.

The following snippet of text is rendered as italicized text.

renders to:

rendered as italicized text

and this HTML:

strikethrough

In GFM (GitHub flavored Markdown) you can do strikethroughs.

Which renders to:

Strike through this text.

HTML:

Blockquotes

For quoting blocks of content from another source within your document.

Add > before any text you want to quote.

Renders to:

Fusion Drive combines a hard drive with a flash storage (solid-state drive) and presents it as a single logical volume with the space of both drives combined.

and this HTML:

Blockquotes can also be nested:

Renders to:

Donec massa lacus, ultricies a ullamcorper in, fermentum sed augue.Nunc augue augue, aliquam non hendrerit ac, commodo vel nisi.> Sed adipiscing elit vitae augue consectetur a gravida nunc vehicula. Donec auctorodio non est accumsan facilisis. Aliquam id turpis in dolor tincidunt mollis ac eu diam.

Notices

The old mechanism for notices overriding the block quote syntax (>>>) has been deprecated. Notices are now handled via a dedicated plugin called Markdown Notices

Lists

Unordered

A list of items in which the order of the items does not explicitly matter.

You may use any of the following symbols to denote bullets for each list item:

For example

Renders to:

• Lorem ipsum dolor sit amet
• Consectetur adipiscing elit
• Integer molestie lorem at massa
• Facilisis in pretium nisl aliquet
• Nulla volutpat aliquam velit
  • Phasellus iaculis neque
  • Purus sodales ultricies
  • Vestibulum laoreet porttitor sem
  • Ac tristique libero volutpat at
• Faucibus porta lacus fringilla vel
• Aenean sit amet erat nunc
• Eget porttitor lorem

And this HTML

Ordered

A list of items in which the order of items does explicitly matter.

Renders to:

1. Lorem ipsum dolor sit amet
2. Consectetur adipiscing elit
3. Integer molestie lorem at massa
4. Facilisis in pretium nisl aliquet
5. Nulla volutpat aliquam velit
6. Faucibus porta lacus fringilla vel
7. Aenean sit amet erat nunc
8. Eget porttitor lorem

And this HTML:

TIP: If you just use 1. for each number, Markdown will automatically number each item. For example:

Renders to:

1. Lorem ipsum dolor sit amet
2. Consectetur adipiscing elit
3. Integer molestie lorem at massa
4. Facilisis in pretium nisl aliquet
5. Nulla volutpat aliquam velit
6. Faucibus porta lacus fringilla vel
7. Aenean sit amet erat nunc
8. Eget porttitor lorem

Code

Inline code

Wrap inline snippets of code with `.

Renders to:

In this example, <section></section> should be wrapped with code.

HTML:

Indented code

Or indent several lines of code by at least four spaces, as in:

Renders to:

HTML:

Block code “fences”

Use “fences” ``` to block in multiple lines of code.

HTML:

Syntax highlighting

GFM, or “GitHub Flavored Markdown” also supports syntax highlighting. To activate it, simply add the file extension of the language you want to use directly after the first code “fence”, `js, and syntax highlighting will automatically be applied in the rendered HTML. For example, to apply syntax highlighting to JavaScript code:

Renders to:

Tables

Tables are created by adding pipes as dividers between each cell, and by adding a line of dashes (also separated by bars) beneath the header. Note that the pipes do not need to be vertically aligned.

Renders to:

And this HTML:

Right aligned text

Adding a colon on the right side of the dashes below any heading will right align text for that column.

Links

Basic link

Renders to (hover over the link, there is no tooltip):

HTML:

Add a title

Renders to (hover over the link, there should be a tooltip):

HTML:

Named Anchors

Named anchors enable you to jump to the specified anchor point on the same page. For example, each of these chapters:

will jump to these sections:

NOTE that specific placement of the anchor tag seems to be arbitrary. They are placed inline here since it seems to be unobtrusive, and it works.

Images

Images have a similar syntax to links but include a preceding exclamation point.

or

Like links, Images also have a footnote style syntax

Alternative usage : note images

With a reference later in the document defining the URL location:

Resizing image

Add HTTP parameters width and/or height to the link image to resize the image. Values are CSS values (default is auto).

Add CSS classes

Add a HTTP classes parameter to the link image to add CSS classes. shadowand border are available but you could define other ones.

• Overview
• Block Elements
• Span Elements
• Miscellaneous

Note: This document is itself written using Markdown; youcan see the source for it by adding ‘.text’ to the URL.

Overview

Philosophy

Markdown is intended to be as easy-to-read and easy-to-write as is feasible.

Readability, however, is emphasized above all else. A Markdown-formatteddocument should be publishable as-is, as plain text, without lookinglike it’s been marked up with tags or formatting instructions. WhileMarkdown’s syntax has been influenced by several existing text-to-HTMLfilters — including Setext, atx, Textile, reStructuredText,Grutatext, and EtText — the single biggest source ofinspiration for Markdown’s syntax is the format of plain text email.

To this end, Markdown’s syntax is comprised entirely of punctuationcharacters, which punctuation characters have been carefully chosen soas to look like what they mean. E.g., asterisks around a word actuallylook like *emphasis*. Markdown lists look like, well, lists. Evenblockquotes look like quoted passages of text, assuming you’ve everused email.

Inline HTML

Markdown’s syntax is intended for one purpose: to be used as aformat for writing for the web.

Markdown is not a replacement for HTML, or even close to it. Itssyntax is very small, corresponding only to a very small subset ofHTML tags. The idea is not to create a syntax that makes it easierto insert HTML tags. In my opinion, HTML tags are already easy toinsert. The idea for Markdown is to make it easy to read, write, andedit prose. HTML is a publishing format; Markdown is a writingformat. Thus, Markdown’s formatting syntax only addresses issues thatcan be conveyed in plain text.

For any markup that is not covered by Markdown’s syntax, you simplyuse HTML itself. There’s no need to preface it or delimit it toindicate that you’re switching from Markdown to HTML; you just usethe tags.

The only restrictions are that block-level HTML elements — e.g. <div>,<table>, <pre>, <p>, etc. — must be separated from surroundingcontent by blank lines, and the start and end tags of the block shouldnot be indented with tabs or spaces. Markdown is smart enough notto add extra (unwanted) <p> tags around HTML block-level tags.

For example, to add an HTML table to a Markdown article:

Note that Markdown formatting syntax is not processed within block-levelHTML tags. E.g., you can’t use Markdown-style *emphasis* inside anHTML block.

Span-level HTML tags — e.g. <span>, <cite>, or <del> — can beused anywhere in a Markdown paragraph, list item, or header. If youwant, you can even use HTML tags instead of Markdown formatting; e.g. ifyou’d prefer to use HTML <a> or <img> tags instead of Markdown’slink or image syntax, go right ahead.

Unlike block-level HTML tags, Markdown syntax is processed withinspan-level tags.

Automatic Escaping for Special Characters

In HTML, there are two characters that demand special treatment: <and &. Left angle brackets are used to start tags; ampersands areused to denote HTML entities. If you want to use them as literalcharacters, you must escape them as entities, e.g. <, and&.

Ampersands in particular are bedeviling for web writers. If you want towrite about ‘AT&T’, you need to write ‘AT&T’. You even need toescape ampersands within URLs. Thus, if you want to link to:

you need to encode the URL as:

in your anchor tag href attribute. Needless to say, this is easy toforget, and is probably the single most common source of HTML validationerrors in otherwise well-marked-up web sites.

Markdown allows you to use these characters naturally, taking care ofall the necessary escaping for you. If you use an ampersand as part ofan HTML entity, it remains unchanged; otherwise it will be translatedinto &.

So, if you want to include a copyright symbol in your article, you can write:

and Markdown will leave it alone. But if you write:

Markdown will translate it to:

Similarly, because Markdown supports inline HTML, if you useangle brackets as delimiters for HTML tags, Markdown will treat them assuch. But if you write:

Markdown will translate it to:

However, inside Markdown code spans and blocks, angle brackets andampersands are always encoded automatically. This makes it easy to useMarkdown to write about HTML code. (As opposed to raw HTML, which is aterrible format for writing about HTML syntax, because every single <and & in your example code needs to be escaped.)

Block Elements

Paragraphs and Line Breaks

A paragraph is simply one or more consecutive lines of text, separatedby one or more blank lines. (A blank line is any line that looks like ablank line — a line containing nothing but spaces or tabs is consideredblank.) Normal paragraphs should not be indented with spaces or tabs.

The implication of the “one or more consecutive lines of text” rule isthat Markdown supports “hard-wrapped” text paragraphs. This differssignificantly from most other text-to-HTML formatters (including MovableType’s “Convert Line Breaks” option) which translate every line breakcharacter in a paragraph into a <br /> tag.

When you do want to insert a <br /> break tag using Markdown, youend a line with two or more spaces, then type return.

Yes, this takes a tad more effort to create a <br />, but a simplistic“every line break is a <br />” rule wouldn’t work for Markdown.Markdown’s email-style blockquoting and multi-paragraph list itemswork best — and look better — when you format them with hard breaks.

Headers

Markdown supports two styles of headers, Setext and atx.

Setext-style headers are “underlined” using equal signs (for first-levelheaders) and dashes (for second-level headers). For example:

Any number of underlining =’s or -’s will work.

Atx-style headers use 1-6 hash characters at the start of the line,corresponding to header levels 1-6. For example:

Optionally, you may “close” atx-style headers. This is purelycosmetic — you can use this if you think it looks better. Theclosing hashes don’t even need to match the number of hashesused to open the header. (The number of opening hashesdetermines the header level.) :

Blockquotes

Markdown uses email-style > characters for blockquoting. If you’refamiliar with quoting passages of text in an email message, then youknow how to create a blockquote in Markdown. It looks best if you hardwrap the text and put a > before every line:

Markdown allows you to be lazy and only put the > before the firstline of a hard-wrapped paragraph:

Blockquotes can be nested (i.e. a blockquote-in-a-blockquote) byadding additional levels of >:

Blockquotes can contain other Markdown elements, including headers, lists,and code blocks:

Any decent text editor should make email-style quoting easy. Forexample, with BBEdit, you can make a selection and choose IncreaseQuote Level from the Text menu.

Lists

Markdown supports ordered (numbered) and unordered (bulleted) lists.

Unordered lists use asterisks, pluses, and hyphens — interchangably — as list markers:

is equivalent to:

and:

Ordered lists use numbers followed by periods:

It’s important to note that the actual numbers you use to mark thelist have no effect on the HTML output Markdown produces. The HTMLMarkdown produces from the above list is:

If you instead wrote the list in Markdown like this:

or even:

you’d get the exact same HTML output. The point is, if you want to,you can use ordinal numbers in your ordered Markdown lists, so thatthe numbers in your source match the numbers in your published HTML.But if you want to be lazy, you don’t have to.

If you do use lazy list numbering, however, you should still start thelist with the number 1. At some point in the future, Markdown may supportstarting ordered lists at an arbitrary number.

List markers typically start at the left margin, but may be indented byup to three spaces. List markers must be followed by one or more spacesor a tab.

To make lists look nice, you can wrap items with hanging indents:

But if you want to be lazy, you don’t have to:

If list items are separated by blank lines, Markdown will wrap theitems in <p> tags in the HTML output. For example, this input:

will turn into:

But this:

will turn into:

List items may consist of multiple paragraphs. Each subsequentparagraph in a list item must be indented by either 4 spacesor one tab:

It looks nice if you indent every line of the subsequentparagraphs, but here again, Markdown will allow you to belazy:

To put a blockquote within a list item, the blockquote’s >delimiters need to be indented:

To put a code block within a list item, the code block needsto be indented twice — 8 spaces or two tabs:

It’s worth noting that it’s possible to trigger an ordered list byaccident, by writing something like this:

In other words, a number-period-space sequence at the beginning of aline. To avoid this, you can backslash-escape the period:

Code Blocks

Pre-formatted code blocks are used for writing about programming ormarkup source code. Rather than forming normal paragraphs, the linesof a code block are interpreted literally. Markdown wraps a code blockin both <pre> and <code> tags.

To produce a code block in Markdown, simply indent every line of theblock by at least 4 spaces or 1 tab. For example, given this input:

Markdown will generate:

One level of indentation — 4 spaces or 1 tab — is removed from eachline of the code block. For example, this:

will turn into:

A code block continues until it reaches a line that is not indented(or the end of the article).

Within a code block, ampersands (&) and angle brackets (< and >)are automatically converted into HTML entities. This makes it veryeasy to include example HTML source code using Markdown — just pasteit and indent it, and Markdown will handle the hassle of encoding theampersands and angle brackets. For example, this:

will turn into:

Regular Markdown syntax is not processed within code blocks. E.g.,asterisks are just literal asterisks within a code block. This meansit’s also easy to use Markdown to write about Markdown’s own syntax.

Horizontal Rules

You can produce a horizontal rule tag (<hr />) by placing three ormore hyphens, asterisks, or underscores on a line by themselves. If youwish, you may use spaces between the hyphens or asterisks. Each of thefollowing lines will produce a horizontal rule:

Span Elements

Links

Markdown supports two style of links: inline and reference.

In both styles, the link text is delimited by [square brackets].

To create an inline link, use a set of regular parentheses immediatelyafter the link text’s closing square bracket. Inside the parentheses,put the URL where you want the link to point, along with an optionaltitle for the link, surrounded in quotes. For example:

Will produce:

If you’re referring to a local resource on the same server, you canuse relative paths:

Reference-style links use a second set of square brackets, insidewhich you place a label of your choosing to identify the link:

You can optionally use a space to separate the sets of brackets:

Then, anywhere in the document, you define your link label like this,on a line by itself:

That is:

• Square brackets containing the link identifier (optionallyindented from the left margin using up to three spaces);
• followed by a colon;
• followed by one or more spaces (or tabs);
• followed by the URL for the link;
• optionally followed by a title attribute for the link, enclosedin double or single quotes, or enclosed in parentheses.

The following three link definitions are equivalent:

Note: There is a known bug in Markdown.pl 1.0.1 which preventssingle quotes from being used to delimit link titles.

The link URL may, optionally, be surrounded by angle brackets:

You can put the title attribute on the next line and use extra spacesor tabs for padding, which tends to look better with longer URLs:

Link definitions are only used for creating links during Markdownprocessing, and are stripped from your document in the HTML output.

Link definition names may consist of letters, numbers, spaces, andpunctuation — but they are not case sensitive. E.g. these twolinks:

are equivalent.

The implicit link name shortcut allows you to omit the name of thelink, in which case the link text itself is used as the name.Just use an empty set of square brackets — e.g., to link the word“Google” to the google.com web site, you could simply write:

And then define the link:

Because link names may contain spaces, this shortcut even works formultiple words in the link text:

And then define the link:

Link definitions can be placed anywhere in your Markdown document. Itend to put them immediately after each paragraph in which they’reused, but if you want, you can put them all at the end of yourdocument, sort of like footnotes.

Here’s an example of reference links in action:

Using the implicit link name shortcut, you could instead write:

Both of the above examples will produce the following HTML output:

For comparison, here is the same paragraph written usingMarkdown’s inline link style:

The point of reference-style links is not that they’re easier towrite. The point is that with reference-style links, your documentsource is vastly more readable. Compare the above examples: usingreference-style links, the paragraph itself is only 81 characterslong; with inline-style links, it’s 176 characters; and as raw HTML,it’s 234 characters. In the raw HTML, there’s more markup than thereis text.

With Markdown’s reference-style links, a source document much moreclosely resembles the final output, as rendered in a browser. Byallowing you to move the markup-related metadata out of the paragraph,you can add links without interrupting the narrative flow of yourprose.

Emphasis

Markdown treats asterisks (*) and underscores (_) as indicators ofemphasis. Text wrapped with one * or _ will be wrapped with anHTML <em> tag; double *’s or _’s will be wrapped with an HTML<strong> tag. E.g., this input:

will produce:

You can use whichever style you prefer; the lone restriction is thatthe same character must be used to open and close an emphasis span.

Emphasis can be used in the middle of a word:

But if you surround an * or _ with spaces, it’ll be treated as aliteral asterisk or underscore.

To produce a literal asterisk or underscore at a position where itwould otherwise be used as an emphasis delimiter, you can backslashescape it:

Code

To indicate a span of code, wrap it with backtick quotes (`).Unlike a pre-formatted code block, a code span indicates code within anormal paragraph. For example:

will produce:

To include a literal backtick character within a code span, you can usemultiple backticks as the opening and closing delimiters:

which will produce this:

The backtick delimiters surrounding a code span may include spaces — one after the opening, one before the closing. This allows you to placeliteral backtick characters at the beginning or end of a code span:

will produce:

With a code span, ampersands and angle brackets are encoded as HTMLentities automatically, which makes it easy to include example HTMLtags. Markdown will turn this:

into:

You can write this:

to produce:

Images

Admittedly, it’s fairly difficult to devise a “natural” syntax forplacing images into a plain text document format.

Markdown uses an image syntax that is intended to resemble the syntaxfor links, allowing for two styles: inline and reference.

Inline image syntax looks like this:

That is:

• An exclamation mark: !;
• followed by a set of square brackets, containing the altattribute text for the image;
• followed by a set of parentheses, containing the URL or path tothe image, and an optional title attribute enclosed in doubleor single quotes.

Reference-style image syntax looks like this:

Where “id” is the name of a defined image reference. Image referencesare defined using syntax identical to link references:

As of this writing, Markdown has no syntax for specifying thedimensions of an image; if this is important to you, you can simplyuse regular HTML <img> tags.

Miscellaneous

Automatic Links

Markdown supports a shortcut style for creating “automatic” links for URLs and email addresses: simply surround the URL or email address with angle brackets. What this means is that if you want to show the actual text of a URL or email address, and also have it be a clickable link, you can do this:

Markdown Center H1

Markdown will turn this into:

Automatic links for email addresses work similarly, except thatMarkdown will also perform a bit of randomized decimal and hexentity-encoding to help obscure your address from address-harvestingspambots. For example, Markdown will turn this:

into something like this:

which will render in a browser as a clickable link to “[email protected]”.

Discord Markdown H1

(This sort of entity-encoding trick will indeed fool many, if notmost, address-harvesting bots, but it definitely won’t fool all ofthem. It’s better than nothing, but an address published in this waywill probably eventually start receiving spam.)

Backslash Escapes

Markdown H1n1 Virus

Markdown allows you to use backslash escapes to generate literalcharacters which would otherwise have special meaning in Markdown’sformatting syntax. For example, if you wanted to surround a wordwith literal asterisks (instead of an HTML <em> tag), you can usebackslashes before the asterisks, like this:

Markdown H1n1 Pandemic

Markdown provides backslash escapes for the following characters: