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authorWaylan Limberg <waylan@gmail.com>2010-02-12 15:27:59 -0500
committerWaylan Limberg <waylan@gmail.com>2010-02-12 15:27:59 -0500
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-Markdown: Syntax
-================
-
-<ul id="ProjectSubmenu">
- <li><a href="/projects/markdown/" title="Markdown Project Page">Main</a></li>
- <li><a href="/projects/markdown/basics" title="Markdown Basics">Basics</a></li>
- <li><a class="selected" title="Markdown Syntax Documentation">Syntax</a></li>
- <li><a href="/projects/markdown/license" title="Pricing and License Information">License</a></li>
- <li><a href="/projects/markdown/dingus" title="Online Markdown Web Form">Dingus</a></li>
-</ul>
-
-
-* [Overview](#overview)
- * [Philosophy](#philosophy)
- * [Inline HTML](#html)
- * [Automatic Escaping for Special Characters](#autoescape)
-* [Block Elements](#block)
- * [Paragraphs and Line Breaks](#p)
- * [Headers](#header)
- * [Blockquotes](#blockquote)
- * [Lists](#list)
- * [Code Blocks](#precode)
- * [Horizontal Rules](#hr)
-* [Span Elements](#span)
- * [Links](#link)
- * [Emphasis](#em)
- * [Code](#code)
- * [Images](#img)
-* [Miscellaneous](#misc)
- * [Backslash Escapes](#backslash)
- * [Automatic Links](#autolink)
-
-
-**Note:** This document is itself written using Markdown; you
-can [see the source for it by adding '.text' to the URL][src].
-
- [src]: /projects/markdown/syntax.text
-
-* * *
-
-<h2 id="overview">Overview</h2>
-
-<h3 id="philosophy">Philosophy</h3>
-
-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-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 -- including [Setext] [1], [atx] [2], [Textile] [3], [reStructuredText] [4],
-[Grutatext] [5], and [EtText] [6] -- the single biggest source of
-inspiration for Markdown's syntax is the format of plain text email.
-
- [1]: http://docutils.sourceforge.net/mirror/setext.html
- [2]: http://www.aaronsw.com/2002/atx/
- [3]: http://textism.com/tools/textile/
- [4]: http://docutils.sourceforge.net/rst.html
- [5]: http://www.triptico.com/software/grutatxt.html
- [6]: http://ettext.taint.org/doc/
-
-To this end, Markdown's syntax is comprised entirely of punctuation
-characters, which punctuation characters have been carefully chosen so
-as to look like what they mean. E.g., asterisks around a word actually
-look like \*emphasis\*. Markdown lists look like, well, lists. Even
-blockquotes look like quoted passages of text, assuming you've ever
-used email.
-
-
-
-<h3 id="html">Inline HTML</h3>
-
-Markdown's syntax is intended for one purpose: to be used as a
-format for *writing* for the web.
-
-Markdown is not a replacement for HTML, or even close to it. Its
-syntax is very small, corresponding only to a very small subset of
-HTML tags. The idea is *not* to create a syntax that makes it easier
-to insert HTML tags. In my opinion, HTML tags are already easy to
-insert. The idea for Markdown is to make it easy to read, write, and
-edit prose. HTML is a *publishing* format; Markdown is a *writing*
-format. Thus, Markdown's formatting syntax only addresses issues that
-can be conveyed in plain text.
-
-For any markup that is not covered by Markdown's syntax, you simply
-use HTML itself. There's no need to preface it or delimit it to
-indicate that you're switching from Markdown to HTML; you just use
-the tags.
-
-The only restrictions are that block-level HTML elements -- e.g. `<div>`,
-`<table>`, `<pre>`, `<p>`, etc. -- must be separated from surrounding
-content by blank lines, and the start and end tags of the block should
-not be indented with tabs or spaces. Markdown is smart enough not
-to add extra (unwanted) `<p>` tags around HTML block-level tags.
-
-For example, to add an HTML table to a Markdown article:
-
- This is a regular paragraph.
-
- <table>
- <tr>
- <td>Foo</td>
- </tr>
- </table>
-
- This is another regular paragraph.
-
-Note that Markdown formatting syntax is not processed within block-level
-HTML tags. E.g., you can't use Markdown-style `*emphasis*` inside an
-HTML block.
-
-Span-level HTML tags -- e.g. `<span>`, `<cite>`, or `<del>` -- can be
-used anywhere in a Markdown paragraph, list item, or header. If you
-want, you can even use HTML tags instead of Markdown formatting; e.g. if
-you'd prefer to use HTML `<a>` or `<img>` tags instead of Markdown's
-link or image syntax, go right ahead.
-
-Unlike block-level HTML tags, Markdown syntax *is* processed within
-span-level tags.
-
-
-<h3 id="autoescape">Automatic Escaping for Special Characters</h3>
-
-In HTML, there are two characters that demand special treatment: `<`
-and `&`. Left angle brackets are used to start tags; ampersands are
-used to denote HTML entities. If you want to use them as literal
-characters, you must escape them as entities, e.g. `&lt;`, and
-`&amp;`.
-
-Ampersands in particular are bedeviling for web writers. If you want to
-write about 'AT&T', you need to write '`AT&amp;T`'. You even need to
-escape ampersands within URLs. Thus, if you want to link to:
-
- http://images.google.com/images?num=30&q=larry+bird
-
-you need to encode the URL as:
-
- http://images.google.com/images?num=30&amp;q=larry+bird
-
-in your anchor tag `href` attribute. Needless to say, this is easy to
-forget, and is probably the single most common source of HTML validation
-errors in otherwise well-marked-up web sites.
-
-Markdown allows you to use these characters naturally, taking care of
-all the necessary escaping for you. If you use an ampersand as part of
-an HTML entity, it remains unchanged; otherwise it will be translated
-into `&amp;`.
-
-So, if you want to include a copyright symbol in your article, you can write:
-
- &copy;
-
-and Markdown will leave it alone. But if you write:
-
- AT&T
-
-Markdown will translate it to:
-
- AT&amp;T
-
-Similarly, because Markdown supports [inline HTML](#html), if you use
-angle brackets as delimiters for HTML tags, Markdown will treat them as
-such. But if you write:
-
- 4 < 5
-
-Markdown will translate it to:
-
- 4 &lt; 5
-
-However, inside Markdown code spans and blocks, angle brackets and
-ampersands are *always* encoded automatically. This makes it easy to use
-Markdown to write about HTML code. (As opposed to raw HTML, which is a
-terrible format for writing about HTML syntax, because every single `<`
-and `&` in your example code needs to be escaped.)
-
-
-* * *
-
-
-<h2 id="block">Block Elements</h2>
-
-
-<h3 id="p">Paragraphs and Line Breaks</h3>
-
-A paragraph is simply one or more consecutive lines of text, separated
-by one or more blank lines. (A blank line is any line that looks like a
-blank line -- a line containing nothing but spaces or tabs is considered
-blank.) Normal paragraphs should not be intended with spaces or tabs.
-
-The implication of the "one or more consecutive lines of text" rule is
-that Markdown supports "hard-wrapped" text paragraphs. This differs
-significantly from most other text-to-HTML formatters (including Movable
-Type's "Convert Line Breaks" option) which translate every line break
-character in a paragraph into a `<br />` tag.
-
-When you *do* want to insert a `<br />` break tag using Markdown, you
-end 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][bq] and multi-paragraph [list items][l]
-work best -- and look better -- when you format them with hard breaks.
-
- [bq]: #blockquote
- [l]: #list
-
-
-
-<h3 id="header">Headers</h3>
-
-Markdown supports two styles of headers, [Setext] [1] and [atx] [2].
-
-Setext-style headers are "underlined" using equal signs (for first-level
-headers) and dashes (for second-level headers). For example:
-
- This is an H1
- =============
-
- This is an H2
- -------------
-
-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:
-
- # This is an H1
-
- ## This is an H2
-
- ###### This is an H6
-
-Optionally, you may "close" atx-style headers. This is purely
-cosmetic -- you can use this if you think it looks better. The
-closing hashes don't even need to match the number of hashes
-used to open the header. (The number of opening hashes
-determines the header level.) :
-
- # This is an H1 #
-
- ## This is an H2 ##
-
- ### This is an H3 ######
-
-
-<h3 id="blockquote">Blockquotes</h3>
-
-Markdown uses email-style `>` characters for blockquoting. If you're
-familiar with quoting passages of text in an email message, then you
-know how to create a blockquote in Markdown. It looks best if you hard
-wrap the text and put a `>` before every line:
-
- > This is a blockquote with two paragraphs. Lorem ipsum dolor sit amet,
- > consectetuer adipiscing elit. Aliquam hendrerit mi posuere lectus.
- > Vestibulum enim wisi, viverra nec, fringilla in, laoreet vitae, risus.
- >
- > Donec sit amet nisl. Aliquam semper ipsum sit amet velit. Suspendisse
- > id sem consectetuer libero luctus adipiscing.
-
-Markdown allows you to be lazy and only put the `>` before the first
-line of a hard-wrapped paragraph:
-
- > This is a blockquote with two paragraphs. Lorem ipsum dolor sit amet,
- consectetuer adipiscing elit. Aliquam hendrerit mi posuere lectus.
- Vestibulum enim wisi, viverra nec, fringilla in, laoreet vitae, risus.
-
- > Donec sit amet nisl. Aliquam semper ipsum sit amet velit. Suspendisse
- id sem consectetuer libero luctus adipiscing.
-
-Blockquotes can be nested (i.e. a blockquote-in-a-blockquote) by
-adding additional levels of `>`:
-
- > This is the first level of quoting.
- >
- > > This is nested blockquote.
- >
- > Back to the first level.
-
-Blockquotes can contain other Markdown elements, including headers, lists,
-and code blocks:
-
- > ## This is a header.
- >
- > 1. This is the first list item.
- > 2. This is the second list item.
- >
- > Here's some example code:
- >
- > return shell_exec("echo $input | $markdown_script");
-
-Any decent text editor should make email-style quoting easy. For
-example, with BBEdit, you can make a selection and choose Increase
-Quote Level from the Text menu.
-
-
-<h3 id="list">Lists</h3>
-
-Markdown supports ordered (numbered) and unordered (bulleted) lists.
-
-Unordered lists use asterisks, pluses, and hyphens -- interchangably
--- as list markers:
-
- * Red
- * Green
- * Blue
-
-is equivalent to:
-
- + Red
- + Green
- + Blue
-
-and:
-
- - Red
- - Green
- - Blue
-
-Ordered lists use numbers followed by periods:
-
- 1. Bird
- 2. McHale
- 3. Parish
-
-It's important to note that the actual numbers you use to mark the
-list have no effect on the HTML output Markdown produces. The HTML
-Markdown produces from the above list is:
-
- <ol>
- <li>Bird</li>
- <li>McHale</li>
- <li>Parish</li>
- </ol>
-
-If you instead wrote the list in Markdown like this:
-
- 1. Bird
- 1. McHale
- 1. Parish
-
-or even:
-
- 3. Bird
- 1. McHale
- 8. Parish
-
-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 that
-the 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 the
-list with the number 1. At some point in the future, Markdown may support
-starting ordered lists at an arbitrary number.
-
-List markers typically start at the left margin, but may be indented by
-up to three spaces. List markers must be followed by one or more spaces
-or a tab.
-
-To make lists look nice, you can wrap items with hanging indents:
-
- * Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
- Aliquam hendrerit mi posuere lectus. Vestibulum enim wisi,
- viverra nec, fringilla in, laoreet vitae, risus.
- * Donec sit amet nisl. Aliquam semper ipsum sit amet velit.
- Suspendisse id sem consectetuer libero luctus adipiscing.
-
-But if you want to be lazy, you don't have to:
-
- * Lorem ipsum dolor sit amet, consectetuer adipiscing elit.
- Aliquam hendrerit mi posuere lectus. Vestibulum enim wisi,
- viverra nec, fringilla in, laoreet vitae, risus.
- * Donec sit amet nisl. Aliquam semper ipsum sit amet velit.
- Suspendisse id sem consectetuer libero luctus adipiscing.
-
-If list items are separated by blank lines, Markdown will wrap the
-items in `<p>` tags in the HTML output. For example, this input:
-
- * Bird
- * Magic
-
-will turn into:
-
- <ul>
- <li>Bird</li>
- <li>Magic</li>
- </ul>
-
-But this:
-
- * Bird
-
- * Magic
-
-will turn into:
-
- <ul>
- <li><p>Bird</p></li>
- <li><p>Magic</p></li>
- </ul>
-
-List items may consist of multiple paragraphs. Each subsequent
-paragraph in a list item must be intended by either 4 spaces
-or one tab:
-
- 1. This is a list item with two paragraphs. Lorem ipsum dolor
- sit amet, consectetuer adipiscing elit. Aliquam hendrerit
- mi posuere lectus.
-
- Vestibulum enim wisi, viverra nec, fringilla in, laoreet
- vitae, risus. Donec sit amet nisl. Aliquam semper ipsum
- sit amet velit.
-
- 2. Suspendisse id sem consectetuer libero luctus adipiscing.
-
-It looks nice if you indent every line of the subsequent
-paragraphs, but here again, Markdown will allow you to be
-lazy:
-
- * This is a list item with two paragraphs.
-
- This is the second paragraph in the list item. You're
- only required to indent the first line. Lorem ipsum dolor
- sit amet, consectetuer adipiscing elit.
-
- * Another item in the same list.
-
-To put a blockquote within a list item, the blockquote's `>`
-delimiters need to be indented:
-
- * A list item with a blockquote:
-
- > This is a blockquote
- > inside a list item.
-
-To put a code block within a list item, the code block needs
-to be indented *twice* -- 8 spaces or two tabs:
-
- * A list item with a code block:
-
- <code goes here>
-
-
-It's worth noting that it's possible to trigger an ordered list by
-accident, by writing something like this:
-
- 1986. What a great season.
-
-In other words, a *number-period-space* sequence at the beginning of a
-line. To avoid this, you can backslash-escape the period:
-
- 1986\. What a great season.
-
-
-
-<h3 id="precode">Code Blocks</h3>
-
-Pre-formatted code blocks are used for writing about programming or
-markup source code. Rather than forming normal paragraphs, the lines
-of a code block are interpreted literally. Markdown wraps a code block
-in both `<pre>` and `<code>` tags.
-
-To produce a code block in Markdown, simply indent every line of the
-block by at least 4 spaces or 1 tab. For example, given this input:
-
- This is a normal paragraph:
-
- This is a code block.
-
-Markdown will generate:
-
- <p>This is a normal paragraph:</p>
-
- <pre><code>This is a code block.
- </code></pre>
-
-One level of indentation -- 4 spaces or 1 tab -- is removed from each
-line of the code block. For example, this:
-
- Here is an example of AppleScript:
-
- tell application "Foo"
- beep
- end tell
-
-will turn into:
-
- <p>Here is an example of AppleScript:</p>
-
- <pre><code>tell application "Foo"
- beep
- end tell
- </code></pre>
-
-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 very
-easy to include example HTML source code using Markdown -- just paste
-it and indent it, and Markdown will handle the hassle of encoding the
-ampersands and angle brackets. For example, this:
-
- <div class="footer">
- &copy; 2004 Foo Corporation
- </div>
-
-will turn into:
-
- <pre><code>&lt;div class="footer"&gt;
- &amp;copy; 2004 Foo Corporation
- &lt;/div&gt;
- </code></pre>
-
-Regular Markdown syntax is not processed within code blocks. E.g.,
-asterisks are just literal asterisks within a code block. This means
-it's also easy to use Markdown to write about Markdown's own syntax.
-
-
-
-<h3 id="hr">Horizontal Rules</h3>
-
-You can produce a horizontal rule tag (`<hr />`) by placing three or
-more hyphens, asterisks, or underscores on a line by themselves. If you
-wish, you may use spaces between the hyphens or asterisks. Each of the
-following lines will produce a horizontal rule:
-
- * * *
-
- ***
-
- *****
-
- - - -
-
- ---------------------------------------
-
- _ _ _
-
-
-* * *
-
-<h2 id="span">Span Elements</h2>
-
-<h3 id="link">Links</h3>
-
-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 immediately
-after the link text's closing square bracket. Inside the parentheses,
-put the URL where you want the link to point, along with an *optional*
-title for the link, surrounded in quotes. For example:
-
- This is [an example](http://example.com/ "Title") inline link.
-
- [This link](http://example.net/) has no title attribute.
-
-Will produce:
-
- <p>This is <a href="http://example.com/" title="Title">
- an example</a> inline link.</p>
-
- <p><a href="http://example.net/">This link</a> has no
- title attribute.</p>
-
-If you're referring to a local resource on the same server, you can
-use relative paths:
-
- See my [About](/about/) page for details.
-
-Reference-style links use a second set of square brackets, inside
-which you place a label of your choosing to identify the link:
-
- This is [an example][id] reference-style link.
-
-You can optionally use a space to separate the sets of brackets:
-
- This is [an example] [id] reference-style link.
-
-Then, anywhere in the document, you define your link label like this,
-on a line by itself:
-
- [id]: http://example.com/ "Optional Title Here"
-
-That is:
-
-* Square brackets containing the link identifier (optionally
- indented 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, enclosed
- in double or single quotes.
-
-The link URL may, optionally, be surrounded by angle brackets:
-
- [id]: <http://example.com/> "Optional Title Here"
-
-You can put the title attribute on the next line and use extra spaces
-or tabs for padding, which tends to look better with longer URLs:
-
- [id]: http://example.com/longish/path/to/resource/here
- "Optional Title Here"
-
-Link definitions are only used for creating links during Markdown
-processing, and are stripped from your document in the HTML output.
-
-Link definition names may constist of letters, numbers, spaces, and punctuation -- but they are *not* case sensitive. E.g. these two links:
-
- [link text][a]
- [link text][A]
-
-are equivalent.
-
-The *implicit link name* shortcut allows you to omit the name of the
-link, 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:
-
- [Google][]
-
-And then define the link:
-
- [Google]: http://google.com/
-
-Because link names may contain spaces, this shortcut even works for
-multiple words in the link text:
-
- Visit [Daring Fireball][] for more information.
-
-And then define the link:
-
- [Daring Fireball]: http://daringfireball.net/
-
-Link definitions can be placed anywhere in your Markdown document. I
-tend to put them immediately after each paragraph in which they're
-used, but if you want, you can put them all at the end of your
-document, sort of like footnotes.
-
-Here's an example of reference links in action:
-
- I get 10 times more traffic from [Google] [1] than from
- [Yahoo] [2] or [MSN] [3].
-
- [1]: http://google.com/ "Google"
- [2]: http://search.yahoo.com/ "Yahoo Search"
- [3]: http://search.msn.com/ "MSN Search"
-
-Using the implicit link name shortcut, you could instead write:
-
- I get 10 times more traffic from [Google][] than from
- [Yahoo][] or [MSN][].
-
- [google]: http://google.com/ "Google"
- [yahoo]: http://search.yahoo.com/ "Yahoo Search"
- [msn]: http://search.msn.com/ "MSN Search"
-
-Both of the above examples will produce the following HTML output:
-
- <p>I get 10 times more traffic from <a href="http://google.com/"
- title="Google">Google</a> than from
- <a href="http://search.yahoo.com/" title="Yahoo Search">Yahoo</a>
- or <a href="http://search.msn.com/" title="MSN Search">MSN</a>.</p>
-
-For comparison, here is the same paragraph written using
-Markdown's inline link style:
-
- I get 10 times more traffic from [Google](http://google.com/ "Google")
- than from [Yahoo](http://search.yahoo.com/ "Yahoo Search") or
- [MSN](http://search.msn.com/ "MSN Search").
-
-The point of reference-style links is not that they're easier to
-write. The point is that with reference-style links, your document
-source is vastly more readable. Compare the above examples: using
-reference-style links, the paragraph itself is only 81 characters
-long; 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 there
-is text.
-
-With Markdown's reference-style links, a source document much more
-closely resembles the final output, as rendered in a browser. By
-allowing you to move the markup-related metadata out of the paragraph,
-you can add links without interrupting the narrative flow of your
-prose.
-
-
-<h3 id="em">Emphasis</h3>
-
-Markdown treats asterisks (`*`) and underscores (`_`) as indicators of
-emphasis. Text wrapped with one `*` or `_` will be wrapped with an
-HTML `<em>` tag; double `*`'s or `_`'s will be wrapped with an HTML
-`<strong>` tag. E.g., this input:
-
- *single asterisks*
-
- _single underscores_
-
- **double asterisks**
-
- __double underscores__
-
-will produce:
-
- <em>single asterisks</em>
-
- <em>single underscores</em>
-
- <strong>double asterisks</strong>
-
- <strong>double underscores</strong>
-
-You can use whichever style you prefer; the lone restriction is that
-the same character must be used to open and close an emphasis span.
-
-Emphasis can be used in the middle of a word:
-
- un*fucking*believable
-
-But if you surround an `*` or `_` with spaces, it'll be treated as a
-literal asterisk or underscore.
-
-To produce a literal asterisk or underscore at a position where it
-would otherwise be used as an emphasis delimiter, you can backslash
-escape it:
-
- \*this text is surrounded by literal asterisks\*
-
-
-
-<h3 id="code">Code</h3>
-
-To indicate a span of code, wrap it with backtick quotes (`` ` ``).
-Unlike a pre-formatted code block, a code span indicates code within a
-normal paragraph. For example:
-
- Use the `printf()` function.
-
-will produce:
-
- <p>Use the <code>printf()</code> function.</p>
-
-To include a literal backtick character within a code span, you can use
-multiple backticks as the opening and closing delimiters:
-
- ``There is a literal backtick (`) here.``
-
-which will produce this:
-
- <p><code>There is a literal backtick (`) here.</code></p>
-
-The backtick delimiters surrounding a code span may include spaces --
-one after the opening, one before the closing. This allows you to place
-literal backtick characters at the beginning or end of a code span:
-
- A single backtick in a code span: `` ` ``
-
- A backtick-delimited string in a code span: `` `foo` ``
-
-will produce:
-
- <p>A single backtick in a code span: <code>`</code></p>
-
- <p>A backtick-delimited string in a code span: <code>`foo`</code></p>
-
-With a code span, ampersands and angle brackets are encoded as HTML
-entities automatically, which makes it easy to include example HTML
-tags. Markdown will turn this:
-
- Please don't use any `<blink>` tags.
-
-into:
-
- <p>Please don't use any <code>&lt;blink&gt;</code> tags.</p>
-
-You can write this:
-
- `&#8212;` is the decimal-encoded equivalent of `&mdash;`.
-
-to produce:
-
- <p><code>&amp;#8212;</code> is the decimal-encoded
- equivalent of <code>&amp;mdash;</code>.</p>
-
-
-
-<h3 id="img">Images</h3>
-
-Admittedly, it's fairly difficult to devise a "natural" syntax for
-placing images into a plain text document format.
-
-Markdown uses an image syntax that is intended to resemble the syntax
-for links, allowing for two styles: *inline* and *reference*.
-
-Inline image syntax looks like this:
-
- ![Alt text](/path/to/img.jpg)
-
- ![Alt text](/path/to/img.jpg "Optional title")
-
-That is:
-
-* An exclamation mark: `!`;
-* followed by a set of square brackets, containing the `alt`
- attribute text for the image;
-* followed by a set of parentheses, containing the URL or path to
- the image, and an optional `title` attribute enclosed in double
- or single quotes.
-
-Reference-style image syntax looks like this:
-
- ![Alt text][id]
-
-Where "id" is the name of a defined image reference. Image references
-are defined using syntax identical to link references:
-
- [id]: url/to/image "Optional title attribute"
-
-As of this writing, Markdown has no syntax for specifying the
-dimensions of an image; if this is important to you, you can simply
-use regular HTML `<img>` tags.
-
-
-* * *
-
-
-<h2 id="misc">Miscellaneous</h2>
-
-<h3 id="autolink">Automatic Links</h3>
-
-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:
-
- <http://example.com/>
-
-Markdown will turn this into:
-
- <a href="http://example.com/">http://example.com/</a>
-
-Automatic links for email addresses work similarly, except that
-Markdown will also perform a bit of randomized decimal and hex
-entity-encoding to help obscure your address from address-harvesting
-spambots. For example, Markdown will turn this:
-
- <address@example.com>
-
-into something like this:
-
- <a href="&#x6D;&#x61;i&#x6C;&#x74;&#x6F;:&#x61;&#x64;&#x64;&#x72;&#x65;
- &#115;&#115;&#64;&#101;&#120;&#x61;&#109;&#x70;&#x6C;e&#x2E;&#99;&#111;
- &#109;">&#x61;&#x64;&#x64;&#x72;&#x65;&#115;&#115;&#64;&#101;&#120;&#x61;
- &#109;&#x70;&#x6C;e&#x2E;&#99;&#111;&#109;</a>
-
-which will render in a browser as a clickable link to "address@example.com".
-
-(This sort of entity-encoding trick will indeed fool many, if not
-most, address-harvesting bots, but it definitely won't fool all of
-them. It's better than nothing, but an address published in this way
-will probably eventually start receiving spam.)
-
-
-
-<h3 id="backslash">Backslash Escapes</h3>
-
-Markdown allows you to use backslash escapes to generate literal
-characters which would otherwise have special meaning in Markdown's
-formatting syntax. For example, if you wanted to surround a word with
-literal asterisks (instead of an HTML `<em>` tag), you can backslashes
-before the asterisks, like this:
-
- \*literal asterisks\*
-
-Markdown provides backslash escapes for the following characters:
-
- \ backslash
- ` backtick
- * asterisk
- _ underscore
- {} curly braces
- [] square brackets
- () parentheses
- # hash mark
- + plus sign
- - minus sign (hyphen)
- . dot
- ! exclamation mark
-