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	spec.txt		spec.txt
	---		---
	标题: CommonMark 规范		标题: CommonMark 规范
	作者: John MacFarlane		作者: John MacFarlane
	version: 0.27		version: 0.28
	date: '2016-11-18'		date: '2017-08-01'
	许可: '[CC-BY-SA 4.0](http://creativecommons.org/licenses/by-sa/4.0/)'		许可: '[CC-BY-SA 4.0](http://creativecommons.org/licenses/by-sa/4.0/)'
	...		...
	# 引言		# 引言
	## 什么是 Markdown？		## 什么是 Markdown？
	Markdown 是一种用于编写结构化文档的纯文本格式，		Markdown 是一种用于编写结构化文档的纯文本格式，
	based on conventions used for indicating formatting in email and		based on conventions for indicating formatting in email
	它由 John Gruber 于 2004 年开发，他编写了		and usenet posts. It was developed by John Gruber (with
	the first Markdown-to-HTML converter in Perl, and it soon became		help from Aaron Swartz) and released in 2004 in the form of a
	ubiquitous. In the next decade, dozens of implementations were		[syntax description](http://daringfireball.net/projects/markdown/syntax)
			and a Perl script (`Markdown.pl`) for converting Markdown to
			HTML. In the next decade, dozens of implementations were
	developed in many languages. Some extended the original		developed in many languages. Some extended the original
	Markdown syntax with conventions for footnotes, tables, and		Markdown syntax with conventions for footnotes, tables, and
	other document elements. Some allowed Markdown documents to be		other document elements. Some allowed Markdown documents to be
	rendered in formats other than HTML. Websites like Reddit,		rendered in formats other than HTML. Websites like Reddit,
	StackOverflow, and GitHub had millions of people using Markdown.		StackOverflow, and GitHub had millions of people using Markdown.
	And Markdown started to be used beyond the web, to author books,		And Markdown started to be used beyond the web, to author books,
	articles, slide shows, letters, and lecture notes.		articles, slide shows, letters, and lecture notes.
	What distinguishes Markdown from many other lightweight markup		What distinguishes Markdown from many other lightweight markup
	syntaxes, which are often easier to write, is its readability.		syntaxes, which are often easier to write, is its readability.
	skipping to change at line 315 ¶		skipping to change at line 317 ¶
	本规范将使用以下字符类定义：		本规范将使用以下字符类定义：
	A [whitespace character](@) is a space		A [whitespace character](@) is a space
	（`U+0020`）、制表符（`U+0009`）、换行符（`U+000A`）、行制表符（`U+000B`）、		（`U+0020`）、制表符（`U+0009`）、换行符（`U+000A`）、行制表符（`U+000B`）、
	换页符（`U+000C`）或回车符（`U+000D`）。		换页符（`U+000C`）或回车符（`U+000D`）。
	[Whitespace](@) is a sequence of one or more [whitespace		[Whitespace](@) is a sequence of one or more [whitespace
	characters].		characters].
	A [Unicode whitespace character](@) is		A [Unicode whitespace character](@) is
	any code point in the Unicode `Zs` class, or a tab (`U+0009`),		any code point in the Unicode `Zs` general category, or a tab (`U+0009`),
	回车符（`U+000D`）、换行符（`U+000A`）或换页符		回车符（`U+000D`）、换行符（`U+000A`）或换页符
	（`U+000C`）。		（`U+000C`）。
	[Unicode whitespace](@) is a sequence of one		[Unicode whitespace](@) is a sequence of one
	or more [Unicode whitespace characters].		or more [Unicode whitespace characters].
	A [space](@) is `U+0020`.		A [space](@) is `U+0020`.
	A [non-whitespace character](@) is any character		A [non-whitespace character](@) is any character
	[空白字符] 的字符。		[空白字符] 的字符。
	An [ASCII punctuation character](@)		An [ASCII punctuation character](@)
	是 `!`, `"`, `#`, `$`, `%`, `&`, `'`, `(`, `)`,		是 `!`, `"`, `#`, `$`, `%`, `&`, `'`, `(`, `)`,
	`*`, `+`, `,`, `-`, `.`, `/`, `:`, `;`, `<`, `=`, `>`, `?`, `@`,		`*`, `+`, `,`, `-`, `.`, `/`, `:`, `;`, `<`, `=`, `>`, `?`, `@`,
	`[`, `\`, `]`, `^`, `_`, `` ` ``, `{`, `|`, `}`, 或 `~`。		`[`, `\`, `]`, `^`, `_`, `` ` ``, `{`, `|`, `}`, 或 `~`。
	A [punctuation character](@) is an [ASCII		A [punctuation character](@) is an [ASCII
	标点字符] 或任何在		标点字符] 或任何在
	the Unicode classes `Pc`, `Pd`, `Pe`, `Pf`, `Pi`, `Po`, or `Ps`.		the general Unicode categories `Pc`, `Pd`, `Pe`, `Pf`, `Pi`, `Po`, or `Ps`.
	## 制表符		## 制表符
	Tabs in lines are not expanded to [spaces]. However,		Tabs in lines are not expanded to [spaces]. However,
	in contexts where whitespace helps to define block structure,		in contexts where whitespace helps to define block structure,
	tabs behave as if they were replaced by spaces with a tab stop		tabs behave as if they were replaced by spaces with a tab stop
	of 4 characters.		of 4 characters.
	Thus, for example, a tab can be used instead of four spaces		Thus, for example, a tab can be used instead of four spaces
	in an indented code block. (Note, however, that internal		in an indented code block. (Note, however, that internal
	skipping to change at line 405 ¶		skipping to change at line 407 ¶
	<p>foo</p>		<p>foo</p>
	<pre><code> bar		<pre><code> bar
	</code></pre>		</code></pre>
	</li>		</li>
	</ul>		</ul>
	````````````````````````````````		````````````````````````````````
	Normally the `>` that begins a block quote may be followed		Normally the `>` that begins a block quote may be followed
	optionally by a space, which is not considered part of the		optionally by a space, which is not considered part of the
	content. In the following case `>` is followed by a tab,		content. In the following case `>` is followed by a tab,
	which is treated as if it were expanded into spaces.		which is treated as if it were expanded into three spaces.
	Since one of theses spaces is considered part of the		Since one of these spaces is considered part of the
	delimiter, `foo` is considered to be indented six spaces		delimiter, `foo` is considered to be indented six spaces
	inside the block quote context, so we get an indented		inside the block quote context, so we get an indented
	code block starting with two spaces.		code block starting with two spaces.
	```````````````````````````````` 示例		```````````````````````````````` 示例
	>→→foo		>→→foo
	.		.
	<blockquote>		<blockquote>
	<pre><code> foo		<pre><code> foo
	</code></pre>		</code></pre>
	skipping to change at line 482 ¶		skipping to change at line 484 ¶
	出于安全考虑，Unicode 字符 `U+0000` 必须被替换		出于安全考虑，Unicode 字符 `U+0000` 必须被替换
	为替换字符 (`U+FFFD`)。		为替换字符 (`U+FFFD`)。
	# 区块与行内元素		# 区块与行内元素
	我们可以将文档视为一系列的		我们可以将文档视为一系列的
	[区块](@)---即段落、区块引用、		[区块](@)---即段落、区块引用、
	列表、标题、分割线和代码块等结构元素。某些区块（例如		列表、标题、分割线和代码块等结构元素。某些区块（例如
	block quotes and list items) contain other blocks; others (like		block quotes and list items) contain other blocks; others (like
	headings and paragraphs) contain [inline](@) content---text,		headings and paragraphs) contain [inline](@) content---text,
	links, emphasized text, images, code, and so on.		links, emphasized text, images, code spans, and so on.
	## Precedence		## Precedence
	Indicators of block structure always take precedence over indicators		Indicators of block structure always take precedence over indicators
	of inline structure. So, for example, the following is a list with		of inline structure. So, for example, the following is a list with
	two items, not a list with one item containing a code span		two items, not a list with one item containing a code span
	```````````````````````````````` 示例		```````````````````````````````` 示例
	- `one		- `one
	- two`		- two`
	skipping to change at line 1559 ¶		skipping to change at line 1561 ¶
	~~~		~~~
	<		<
	>		>
	~~~		~~~
	.		.
	<pre><code>&lt;		<pre><code>&lt;
	&gt;		&gt;
	</code></pre>		</code></pre>
	````````````````````````````````		````````````````````````````````
			少于三个反引号是不够的
			```````````````````````````````` 示例
			``
			foo
			``
			.
			<p><code>foo</code></p>
			````````````````````````````````
	The closing code fence must use the same character as the opening		The closing code fence must use the same character as the opening
	fence		fence
	```````````````````````````````` 示例		```````````````````````````````` 示例
	```		```
	aaa		aaa
	~~~		~~~
	```		```
	.		.
	<pre><code>aaa		<pre><code>aaa
	skipping to change at line 1918 ¶		skipping to change at line 1930 ¶
	[空白]、行尾、字符串 `>` 或		[空白]、行尾、字符串 `>` 或
	字符串 `/>`。\		字符串 `/>`。\
	**结束条件：** 行后紧跟一个 [空行]。		**结束条件：** 行后紧跟一个 [空行]。
	7. **Start condition:** line begins with a complete [open tag]		7. **Start condition:** line begins with a complete [open tag]
	or [closing tag] (with any [tag name] other than `script`,		or [closing tag] (with any [tag name] other than `script`,
	`style`, or `pre`) followed only by [whitespace]		`style`, or `pre`) followed only by [whitespace]
	All types of [HTML blocks] except type 7 may interrupt		All types of [HTML blocks] except type 7 may interrupt
	**结束条件：** 行后紧跟一个 [空行]。		**结束条件：** 行后紧跟一个 [空行]。
			HTML blocks continue until they are closed by their appropriate
			[end condition], or the last line of the document or other [container block].
			This means any HTML **within an HTML block** that might otherwise be recognised
			as a start condition will be ignored by the parser and passed through as-is,
			without changing the parser's state.
			For instance, `<pre>` within a HTML block started by `<table>` will not affect
			the parser state; as the HTML block was started in by start condition 6, it
			will end at any blank line. This can be surprising
			```````````````````````````````` 示例
			<table><tr><td>
			<pre>
			**Hello**,
			_world_.
			</pre>
			</td></tr></table>
			.
			<table><tr><td>
			<pre>
			**Hello**,
			<p><em>world</em>.
			</pre></p>
			</td></tr></table>
			````````````````````````````````
			In this case, the HTML block is terminated by the newline — the `**hello**`
			text remains verbatim — and regular parsing resumes, with a paragraph,
			emphasised `world` and inline and block HTML following.
	除第 7 类之外的所有 [HTML 块] 类型都可以中断		除第 7 类之外的所有 [HTML 块] 类型都可以中断
	一个段落。第 7 类块不能中断段落。		一个段落。第 7 类块不能中断段落。
	(This restriction is intended to prevent unwanted interpretation		(This restriction is intended to prevent unwanted interpretation
	进行意外的 HTML 块起始解释。）		进行意外的 HTML 块起始解释。）
	下面是一些简单的例子。以下是第 6 类的一些基本 HTML 块		下面是一些简单的例子。以下是第 6 类的一些基本 HTML 块
	of type 6		of type 6
	```````````````````````````````` 示例		```````````````````````````````` 示例
	<table>		<table>
	skipping to change at line 3416 ¶		skipping to change at line 3459 ¶
	blocks *Bs* starting with a [non-whitespace character] and not separated		blocks *Bs* starting with a [non-whitespace character] and not separated
	from each other by more than one blank line, and *M* is a list		from each other by more than one blank line, and *M* is a list
	marker of width *W* followed by 1 ≤ *N* ≤ 4 spaces, then the result		marker of width *W* followed by 1 ≤ *N* ≤ 4 spaces, then the result
	of prepending *M* and the following spaces to the first line of		of prepending *M* and the following spaces to the first line of
	*Ls*, and indenting subsequent lines of *Ls* by *W + N* spaces, is a		*Ls*, and indenting subsequent lines of *Ls* by *W + N* spaces, is a
	list item with *Bs* as its contents. The type of the list item		list item with *Bs* as its contents. The type of the list item
	(bullet or ordered) is determined by the type of its list marker.		(bullet or ordered) is determined by the type of its list marker.
	If the list item is ordered, then it is also assigned a start		If the list item is ordered, then it is also assigned a start
	number, based on the ordered list marker.		number, based on the ordered list marker.
	Exceptions: When the first list item in a [list] interrupts		例外
	a paragraph---that is, when it starts on a line that would
	otherwise count as [paragraph continuation text]---then (a)		1. When the first list item in a [list] interrupts
	the lines *Ls* must not begin with a blank line, and (b) if		a paragraph---that is, when it starts on a line that would
	the list item is ordered, the start number must be 1.		otherwise count as [paragraph continuation text]---then (a)
			the lines *Ls* must not begin with a blank line, and (b) if
			the list item is ordered, the start number must be 1.
			2. If any line is a [thematic break][thematic breaks] then
			that line is not a list item.
	For example, let *Ls* be the lines		For example, let *Ls* be the lines
	```````````````````````````````` 示例		```````````````````````````````` 示例
	A paragraph		A paragraph
	with two lines.		with two lines.
	indented code		indented code
	> A block quote.		> A block quote.
	skipping to change at line 5458 ¶		skipping to change at line 5505 ¶
	.		.
	<p>```foo``</p>		<p>```foo``</p>
	````````````````````````````````		````````````````````````````````
	```````````````````````````````` 示例		```````````````````````````````` 示例
	`foo		`foo
	.		.
	<p>`foo</p>		<p>`foo</p>
	````````````````````````````````		````````````````````````````````
			The following case also illustrates the need for opening and
			closing backtick strings to be equal in length
			```````````````````````````````` 示例
			`foo``bar``
			.
			<p>`foo<code>bar</code></p>
			````````````````````````````````
	## Emphasis and strong emphasis		## Emphasis and strong emphasis
	John Gruber's original [Markdown syntax		John Gruber's original [Markdown syntax
	description](http://daringfireball.net/projects/markdown/syntax#em) says		description](http://daringfireball.net/projects/markdown/syntax#em) says
	> Markdown treats asterisks (`*`) and underscores (`_`) as indicators of		> Markdown treats asterisks (`*`) and underscores (`_`) as indicators of
	> emphasis. Text wrapped with one `*` or `_` will be wrapped with an HTML		> 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>`		> `<em>` tag; double `*`'s or `_`'s will be wrapped with an HTML `<strong>`
	> tag.		> tag.
	skipping to change at line 5506 ¶		skipping to change at line 5562 ¶
	``` markdown		``` markdown
	internal emphasis: foo*bar*baz		internal emphasis: foo*bar*baz
	no emphasis: foo_bar_baz		no emphasis: foo_bar_baz
	```		```
	下面给出的规则涵盖了所有这些模式，同时允许		下面给出的规则涵盖了所有这些模式，同时允许
	使用不需要回溯的高效解析策略。		使用不需要回溯的高效解析策略。
	First, some definitions. A [delimiter run](@) is either		First, some definitions. A [delimiter run](@) is either
	一个或多个 `*` 字符组成的序列，且其前后没有		一个或多个 `*` 字符组成的序列，且其前后没有
	followed by a `*` character, or a sequence of one or more `_`		followed by a non-backslash-escaped `*` character, or a sequence
	字符组成的序列，且其前后没有 `_` 字符。		of one or more `_` characters that is not preceded or followed by
			a non-backslash-escaped `_` character.
	A [left-flanking delimiter run](@) is		A [left-flanking delimiter run](@) is
	a [delimiter run] that is (a) not followed by [Unicode whitespace],		a [delimiter run] that is (a) not followed by [Unicode whitespace],
	and (b) either not followed by a [punctuation character], or		and (b) not followed by a [punctuation character], or
	preceded by [Unicode whitespace] or a [punctuation character].		preceded by [Unicode whitespace] or a [punctuation character].
	就此定义而言，行的开头和结尾		就此定义而言，行的开头和结尾
	the line count as Unicode whitespace.		the line count as Unicode whitespace.
	A [right-flanking delimiter run](@) is		A [right-flanking delimiter run](@) is
	a [delimiter run] that is (a) not preceded by [Unicode whitespace],		a [delimiter run] that is (a) not preceded by [Unicode whitespace],
	and (b) either not preceded by a [punctuation character], or		and (b) not preceded by a [punctuation character], or
	followed by [Unicode whitespace] or a [punctuation character].		followed by [Unicode whitespace] or a [punctuation character].
	就此定义而言，行的开头和结尾		就此定义而言，行的开头和结尾
	the line count as Unicode whitespace.		the line count as Unicode whitespace.
	以下是一些定界符序列的示例。		以下是一些定界符序列的示例。
	- 左侧分隔但非右侧分隔		- 左侧分隔但非右侧分隔
	```		```
	***abc		***abc
	skipping to change at line 5597 ¶		skipping to change at line 5654 ¶
	6. A double `__` [can open strong emphasis] iff		6. A double `__` [can open strong emphasis] iff
	它是 [左侧定界符序列] 的一部分		它是 [左侧定界符序列] 的一部分
	and either (a) not part of a [right-flanking delimiter run]		and either (a) not part of a [right-flanking delimiter run]
	or (b) part of a [right-flanking delimiter run]		or (b) part of a [right-flanking delimiter run]
	preceded by punctuation.		preceded by punctuation.
	7. A double `**` [can close strong emphasis](@)		7. A double `**` [can close strong emphasis](@)
	当且仅当它是 [右侧定界符序列] 的一部分时。		当且仅当它是 [右侧定界符序列] 的一部分时。
	8. 双 `__` [可以关闭强强调]		8. A double `__` [can close strong emphasis] iff
	it is part of a [right-flanking delimiter run]		it is part of a [right-flanking delimiter run]
	and either (a) not part of a [left-flanking delimiter run]		and either (a) not part of a [left-flanking delimiter run]
	or (b) part of a [left-flanking delimiter run]		or (b) part of a [left-flanking delimiter run]
	followed by punctuation.		followed by punctuation.
	9. 强调以一个 [可以开启强调] 的定界符开始，并以		9. 强调以一个 [可以开启强调] 的定界符开始，并以
	一个 [可以关闭强调] 的定界符结束，且使用相同的		一个 [可以关闭强调] 的定界符结束，且使用相同的
	character (`_` or `*`) as the opening delimiter. The		character (`_` or `*`) as the opening delimiter. The
	opening and closing delimiters must belong to separate		opening and closing delimiters must belong to separate
	[delimiter runs]. If one of the delimiters can both		[delimiter runs]. If one of the delimiters can both
	skipping to change at line 5637 ¶		skipping to change at line 5694 ¶
	`_`-delimited emphasis or `__`-delimited strong emphasis, unless it		`_`-delimited emphasis or `__`-delimited strong emphasis, unless it
	is backslash-escaped.		is backslash-escaped.
	Where rules 1--12 above are compatible with multiple parsings,		Where rules 1--12 above are compatible with multiple parsings,
	the following principles resolve ambiguity		the following principles resolve ambiguity
	13. The number of nestings should be minimized. Thus, for example,		13. The number of nestings should be minimized. Thus, for example,
	an interpretation `<strong>...</strong>` is always preferred to		an interpretation `<strong>...</strong>` is always preferred to
	`<em><em>...</em></em>`.		`<em><em>...</em></em>`.
	14. An interpretation `<strong><em>...</em></strong>` is always		14. An interpretation `<em><strong>...</strong></em>` is always
	preferred to `<em><strong>..</strong></em>`.		preferred to `<strong><em>...</em></strong>`.
	15. When two potential emphasis or strong emphasis spans overlap,		15. When two potential emphasis or strong emphasis spans overlap,
	so that the second begins before the first ends and ends after		so that the second begins before the first ends and ends after
	the first ends, the first takes precedence. Thus, for example,		the first ends, the first takes precedence. Thus, for example,
	`*foo _bar* baz_` is parsed as `<em>foo _bar</em> baz_` rather		`*foo _bar* baz_` is parsed as `<em>foo _bar</em> baz_` rather
	than `*foo <em>bar* baz</em>`.		than `*foo <em>bar* baz</em>`.
	16. When there are two potential emphasis or strong emphasis spans		16. When there are two potential emphasis or strong emphasis spans
	with the same closing delimiter, the shorter one (the one that		with the same closing delimiter, the shorter one (the one that
	opens later) takes precedence. Thus, for example,		opens later) takes precedence. Thus, for example,
	skipping to change at line 6542 ¶		skipping to change at line 6599 ¶
	******foo******		******foo******
	.		.
	<p><strong><strong><strong>foo</strong></strong></strong></p>		<p><strong><strong><strong>foo</strong></strong></strong></p>
	````````````````````````````````		````````````````````````````````
	规则 14		规则 14
	```````````````````````````````` 示例		```````````````````````````````` 示例
	***foo***		***foo***
	.		.
	<p><strong><em>foo</em></strong></p>		<p><em><strong>foo</strong></em></p>
	````````````````````````````````		````````````````````````````````
	```````````````````````````````` 示例		```````````````````````````````` 示例
	_____foo_____		_____foo_____
	.		.
	<p><strong><strong><em>foo</em></strong></strong></p>		<p><em><strong><strong>foo</strong></strong></em></p>
	````````````````````````````````		````````````````````````````````
	规则 15		规则 15
	```````````````````````````````` 示例		```````````````````````````````` 示例
	*foo _bar* baz_		*foo _bar* baz_
	.		.
	<p><em>foo _bar</em> baz_</p>		<p><em>foo _bar</em> baz_</p>
	````````````````````````````````		````````````````````````````````
	skipping to change at line 6674 ¶		skipping to change at line 6731 ¶
	A [link destination](@) consists of either		A [link destination](@) consists of either
	- a sequence of zero or more characters between an opening `<` and a		- a sequence of zero or more characters between an opening `<` and a
	closing `>` that contains no spaces, line breaks, or unescaped		closing `>` that contains no spaces, line breaks, or unescaped
	`<` or `>` characters, or		`<` or `>` characters, or
	- a nonempty sequence of characters that does not include		- a nonempty sequence of characters that does not include
	ASCII space or control characters, and includes parentheses		ASCII space or control characters, and includes parentheses
	only if (a) they are backslash-escaped or (b) they are part of		only if (a) they are backslash-escaped or (b) they are part of
	a balanced pair of unescaped parentheses that is not itself		a balanced pair of unescaped parentheses. (Implementations
	inside a balanced pair of unescaped parentheses.		may impose limits on parentheses nesting to avoid performance
			issues, but at least three levels of nesting should be supported.)
	A [link title](@) consists of either		A [link title](@) consists of either
	- a sequence of zero or more characters between straight double-quote		- a sequence of zero or more characters between straight double-quote
	characters (`"`), including a `"` character only if it is		characters (`"`), including a `"` character only if it is
	backslash-escaped, or		backslash-escaped, or
	- a sequence of zero or more characters between straight single-quote		- a sequence of zero or more characters between straight single-quote
	characters (`'`), including a `'` character only if it is		characters (`'`), including a `'` character only if it is
	backslash-escaped, or		backslash-escaped, or
	skipping to change at line 6774 ¶		skipping to change at line 6832 ¶
	````````````````````````````````		````````````````````````````````
	链接目标内的圆括号可以进行转义		链接目标内的圆括号可以进行转义
	```````````````````````````````` 示例		```````````````````````````````` 示例
	[link](\(foo\))		[link](\(foo\))
	.		.
	<p><a href="(foo)">link</a></p>		<p><a href="(foo)">link</a></p>
	````````````````````````````````		````````````````````````````````
	在不进行转义的情况下，允许使用一层平衡的圆括号。		Any number of parentheses are allowed without escaping, as long as they are
			balanced
	```````````````````````````````` 示例
	[link]((foo)and(bar))
	.
	<p><a href="(foo)and(bar)">link</a></p>
	````````````````````````````````
	然而，如果括号内包含括号，你需要进行转义
	或使用 `<...>` 形式
	```````````````````````````````` 示例		```````````````````````````````` 示例
	[link](foo(and(bar)))		[link](foo(and(bar)))
	.		.
	<p>[link](foo(and(bar)))</p>		<p><a href="foo(and(bar))">link</a></p>
	````````````````````````````````		````````````````````````````````
			However, if you have unbalanced parentheses, you need to escape or use the
			`<...>` form
	```````````````````````````````` 示例		```````````````````````````````` 示例
	[link](foo(and\(bar\)))		[link](foo\(and\(bar\))
	.		.
	<p><a href="foo(and(bar))">link</a></p>		<p><a href="foo(and(bar)">link</a></p>
	````````````````````````````````		````````````````````````````````
	```````````````````````````````` 示例		```````````````````````````````` 示例
	[link](<foo(and(bar))>)		[link](<foo(and(bar)>)
	.		.
	<p><a href="foo(and(bar))">link</a></p>		<p><a href="foo(and(bar)">link</a></p>
	````````````````````````````````		````````````````````````````````
	Parentheses and other symbols can also be escaped, as usual		Parentheses and other symbols can also be escaped, as usual
	in Markdown		in Markdown
	```````````````````````````````` 示例		```````````````````````````````` 示例
	[link](foo\)\:)		[link](foo\)\:)
	.		.
	<p><a href="foo):">link</a></p>		<p><a href="foo):">link</a></p>
	````````````````````````````````		````````````````````````````````
	skipping to change at line 7056 ¶		skipping to change at line 7109 ¶
	[full](#full-reference-link), [collapsed](#collapsed-reference-link),		[full](#full-reference-link), [collapsed](#collapsed-reference-link),
	and [shortcut](#shortcut-reference-link).		and [shortcut](#shortcut-reference-link).
	A [full reference link](@)		A [full reference link](@)
	consists of a [link text] immediately followed by a [link label]		consists of a [link text] immediately followed by a [link label]
	that [matches] a [link reference definition] elsewhere in the document.		that [matches] a [link reference definition] elsewhere in the document.
	A [link label](@) begins with a left bracket (`[`) and ends		A [link label](@) begins with a left bracket (`[`) and ends
	并以第一个未被反斜杠转义的右方括号（`]`）结束。		并以第一个未被反斜杠转义的右方括号（`]`）结束。
	在这些方括号之间必须至少有一个 [非空白字符]。		在这些方括号之间必须至少有一个 [非空白字符]。
	未转义的方括号字符在 [链接标签] 中是不允许的。		Unescaped square bracket characters are not allowed inside the
	[link labels]. A link label can have at most 999		opening and closing square brackets of [link labels]. A link
	characters inside the square brackets.		label can have at most 999 characters inside the square
			brackets.
	One label [matches](@)		One label [matches](@)
	另一个。要归一化一个标签，执行 *unicode 大小写折叠* 并将连续的内部		另一个。要归一化一个标签，执行 *unicode 大小写折叠* 并将连续的内部
	label, perform the *Unicode case fold* and collapse consecutive internal		label, strip off the opening and closing brackets,
			perform the *Unicode case fold*, strip leading and trailing
			[whitespace] and collapse consecutive internal
	匹配的引用链接定义，则使用文档中首先出现的那个。		匹配的引用链接定义，则使用文档中首先出现的那个。
	（在这种情况下，发出警告是可取的。）		（在这种情况下，发出警告是可取的。）
	第一个链接标签的内容被解析为行内内容，		第一个链接标签的内容被解析为行内内容，
	并用作链接的文本。链接的 URI 和标题由		并用作链接的文本。链接的 URI 和标题由
	匹配的 [链接引用定义] 提供。		匹配的 [链接引用定义] 提供。
	matching [link reference definition].		matching [link reference definition].
	这是一个简单的例子		这是一个简单的例子
	skipping to change at line 7752 ¶		skipping to change at line 7808 ¶
	链接标签不区分大小写。		链接标签不区分大小写。
	```````````````````````````````` 示例		```````````````````````````````` 示例
	![Foo]		![Foo]
	[foo]: /url "title"		[foo]: /url "title"
	.		.
	<p><img src="/url" alt="Foo" title="title" /></p>		<p><img src="/url" alt="Foo" title="title" /></p>
	````````````````````````````````		````````````````````````````````
	If you just want bracketed text, you can backslash-escape the		If you just want a literal `!` followed by bracketed text, you can
	opening `!` and `[`:		backslash-escape the opening `[`:
	```````````````````````````````` 示例		```````````````````````````````` 示例
	\!\[foo]		!\[foo]
	[foo]: /url "title"		[foo]: /url "title"
	.		.
	<p>![foo]</p>		<p>![foo]</p>
	````````````````````````````````		````````````````````````````````
	If you want a link after a literal `!`, backslash-escape the		If you want a link after a literal `!`, backslash-escape the
	`!`:		`!`:
	```````````````````````````````` 示例		```````````````````````````````` 示例
End of changes. 29 change blocks.
	49 lines changed or deleted		105 lines changed or added
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