spec.txt		spec.txt
	---		---
	标题: CommonMark 规范		标题: CommonMark 规范
	作者: John MacFarlane		作者: John MacFarlane
	version: 0.18		version: 0.19
	date: 2015-03-03		date: 2015-04-27
	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，
	基于在电子邮件和 usenet 帖子中用于表示格式的约定。		基于在电子邮件和 usenet 帖子中用于表示格式的约定。
	它由 John Gruber 于 2004 年开发，他编写了		它由 John Gruber 于 2004 年开发，他编写了
	skipping to change at line 195		skipping to change at line 195
	Since this document describes how Markdown is to be parsed into		Since this document describes how Markdown is to be parsed into
	an abstract syntax tree, it would have made sense to use an abstract		an abstract syntax tree, it would have made sense to use an abstract
	representation of the syntax tree instead of HTML. But HTML is capable		representation of the syntax tree instead of HTML. But HTML is capable
	of representing the structural distinctions we need to make, and the		of representing the structural distinctions we need to make, and the
	choice of HTML for the tests makes it possible to run the tests against		choice of HTML for the tests makes it possible to run the tests against
	an implementation without writing an abstract syntax tree renderer.		an implementation without writing an abstract syntax tree renderer.
	This document is generated from a text file, `spec.txt`, written		This document is generated from a text file, `spec.txt`, written
	in Markdown with a small extension for the side-by-side tests.		in Markdown with a small extension for the side-by-side tests.
	The script `spec2md.pl` can be used to turn `spec.txt` into pandoc		The script `tools/makespec.py` can be used to convert `spec.txt` into
	Markdown, which can then be converted into other formats.		HTML or CommonMark (which can then be converted into other formats).
	在示例中，使用 `→` 字符来表示制表符（tab）。		在示例中，使用 `→` 字符来表示制表符（tab）。
	# 序言		# 序言
	## 字符与行		## 字符与行
	Any sequence of [character]s is a valid CommonMark		Any sequence of [character]s is a valid CommonMark
	文档。		文档。
	skipping to change at line 727		skipping to change at line 727
	### ###		### ###
	.		.
	<h2></h2>		<h2></h2>
	<h1></h1>		<h1></h1>
	<h3></h3>		<h3></h3>
	.		.
	## Setext headers		## Setext headers
	A [setext header](@setext-header)		A [setext header](@setext-header)
	consists of a line of text, containing at least one		consists of a line of text, containing at least one [non-space character],
	[non-space character],
	with no more than 3 spaces indentation, followed by a [setext header		with no more than 3 spaces indentation, followed by a [setext header
	underline]. The line of text must be		underline]. The line of text must be
	one that, were it not followed by the setext header underline,		one that, were it not followed by the setext header underline,
	would be interpreted as part of a paragraph: it cannot be a code		would be interpreted as part of a paragraph: it cannot be
	block, header, blockquote, horizontal rule, or list.		interpretable as a [code fence], [ATX header][ATX headers],
			[block quote][block quotes], [horizontal rule][horizontal rules],
			[list item][list items], or [HTML block][HTML blocks].
	A [setext header underline](@setext-header-underline) is a sequence of		A [setext header underline](@setext-header-underline) is a sequence of
	`=` characters or a sequence of `-` characters, with no more than 3		`=` characters or a sequence of `-` characters, with no more than 3
	spaces indentation and any number of trailing spaces. If a line		spaces indentation and any number of trailing spaces. If a line
	containing a single `-` can be interpreted as an		containing a single `-` can be interpreted as an
	empty [list items], it should be interpreted this way		empty [list items], it should be interpreted this way
	and not as a [setext header underline].		and not as a [setext header underline].
	The header is a level 1 header if `=` characters are used in the		The header is a level 1 header if `=` characters are used in the
	[setext header underline], and a level 2		[setext header underline], and a level 2
	skipping to change at line 1804		skipping to change at line 1805
	A [link reference definition](@link-reference-definition)		A [link reference definition](@link-reference-definition)
	由[链接标签]组成，缩进最多三个空格，然后是		由[链接标签]组成，缩进最多三个空格，然后是
	by a colon (`:`), optional [whitespace] (including up to one		by a colon (`:`), optional [whitespace] (including up to one
	[line ending]), a [link destination],		[line ending]), a [link destination],
	可选的[空白]（包括最多一个		可选的[空白]（包括最多一个
	[line ending]), and an optional [link		[line ending]), and an optional [link
	title], which if it is present must be separated		title], which if it is present must be separated
	from the [link destination] by [whitespace].		from the [link destination] by [whitespace].
	No further [non-space character]s may occur on the line.		No further [non-space character]s may occur on the line.
	A [link reference-definition]		A [link reference definition]
	does not correspond to a structural element of a document. Instead, it		does not correspond to a structural element of a document. Instead, it
	defines a label which can be used in [reference link]s		defines a label which can be used in [reference link]s
	and reference-style [images] elsewhere in the document. [Link		and reference-style [images] elsewhere in the document. [Link
	reference definitions] can come either before or after the links that use		reference definitions] can come either before or after the links that use
	them.		them.
	.		.
	[foo]: /url "title"		[foo]: /url "title"
	[foo]		[foo]
	skipping to change at line 2573		skipping to change at line 2574
	An [ordered list marker](@ordered-list-marker)		An [ordered list marker](@ordered-list-marker)
	is a sequence of one of more digits (`0-9`), followed by either a		is a sequence of one of more digits (`0-9`), followed by either a
	`.` character or a `)` character.		`.` character or a `)` character.
	The following rules define [list items]		The following rules define [list items]
	1. **Basic case.** If a sequence of lines *Ls* constitute a sequence of		1. **Basic case.** If a sequence of lines *Ls* constitute a sequence of
	blocks *Bs* starting with a [non-space character] and not separated		blocks *Bs* starting with a [non-space 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 *M* of width *W* followed by 0 < *N* < 5 spaces, then the result		marker of width *W* followed by 0 < *N* < 5 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.
	For example, let *Ls* be the lines		For example, let *Ls* be the lines
	.		.
	skipping to change at line 2712		skipping to change at line 2713
	<p>one</p>		<p>one</p>
	<p>two</p>		<p>two</p>
	</li>		</li>
	</ol>		</ol>
	</blockquote>		</blockquote>
	</blockquote>		</blockquote>
	.		.
	Here `two` occurs in the same column as the list marker `1.`,		Here `two` occurs in the same column as the list marker `1.`,
	but is actually contained in the list item, because there is		but is actually contained in the list item, because there is
	sufficent indentation after the last containing blockquote marker.		sufficient indentation after the last containing blockquote marker.
	The converse is also possible. In the following example, the word `two`		The converse is also possible. In the following example, the word `two`
	occurs far to the right of the initial text of the list item, `one`, but		occurs far to the right of the initial text of the list item, `one`, but
	it is not considered part of the list item, because it is not indented		it is not considered part of the list item, because it is not indented
	far enough past the blockquote marker		far enough past the blockquote marker
	.		.
	>>- one		>>- one
	>>		>>
	> > two		> > two
	skipping to change at line 2833		skipping to change at line 2834
	<blockquote>		<blockquote>
	<p>bam</p>		<p>bam</p>
	</blockquote>		</blockquote>
	</li>		</li>
	</ol>		</ol>
	.		.
	2. **Item starting with indented code.** If a sequence of lines *Ls*		2. **Item starting with indented code.** If a sequence of lines *Ls*
	constitute a sequence of blocks *Bs* starting with an indented code		constitute a sequence of blocks *Bs* starting with an indented code
	块，且彼此之间没有被超过一个空行隔开，		块，且彼此之间没有被超过一个空行隔开，
	and *M* is a list marker *M* of width *W* followed by		且*M*是一个宽度为*W*的列表标记，后跟
	一个空格，则预置*M*和其后的		一个空格，则预置*M*和其后的
	space to the first line of *Ls*, and indenting subsequent lines of		space to the first line of *Ls*, and indenting subsequent lines of
	*Ls* by *W + 1* spaces, is a list item with *Bs* as its contents.		*Ls* by *W + 1* spaces, is a list item with *Bs* as its contents.
	If a line is empty, then it need not be indented. The type of the		If a line is empty, then it need not be indented. The type of the
	list item (bullet or ordered) is determined by the type of its list		list item (bullet or ordered) is determined by the type of its list
	marker. If the list item is ordered, then it is also assigned a		marker. If the list item is ordered, then it is also assigned a
	start number, based on the ordered list marker.		start number, based on the ordered list marker.
	一个缩进的代码块需要比段落多缩进四个空格。		一个缩进的代码块需要比段落多缩进四个空格。
	the edge of the region where text will be included in the list item.		the edge of the region where text will be included in the list item.
	skipping to change at line 2982		skipping to change at line 2983
	<li>		<li>
	<p>foo</p>		<p>foo</p>
	<p>bar</p>		<p>bar</p>
	</li>		</li>
	</ul>		</ul>
	.		.
	3. **Item starting with a blank line.** If a sequence of lines *Ls*		3. **Item starting with a blank line.** If a sequence of lines *Ls*
	starting with a single [blank line] constitute a (possibly empty)		starting with a single [blank line] constitute a (possibly empty)
	sequence of blocks *Bs*, not separated from each other by more than		sequence of blocks *Bs*, not separated from each other by more than
	one blank line, and *M* is a list marker *M* of width *W*,		one blank line, and *M* is a list marker of width *W*,
	then the result of prepending *M* to the first line of *Ls*, and		then the result of prepending *M* to the first line of *Ls*, and
	indenting subsequent lines of *Ls* by *W + 1* spaces, is a list		indenting subsequent lines of *Ls* by *W + 1* spaces, is a list
	item with *Bs* as its contents.		item with *Bs* as its contents.
	If a line is empty, then it need not be indented. The type of the		If a line is empty, then it need not be indented. The type of the
	list item (bullet or ordered) is determined by the type of its list		list item (bullet or ordered) is determined by the type of its list
	marker. If the list item is ordered, then it is also assigned a		marker. If the list item is ordered, then it is also assigned a
	start number, based on the ordered list marker.		start number, based on the ordered list marker.
	以下是一些以空行开头但不为空的列表项		以下是一些以空行开头但不为空的列表项
	skipping to change at line 3070		skipping to change at line 3071
	.		.
	*		*
	.		.
	<ul>		<ul>
	<li></li>		<li></li>
	</ul>		</ul>
	.		.
	4. **Indentation.** If a sequence of lines *Ls* constitutes a list item		4. **Indentation.** If a sequence of lines *Ls* constitutes a list item
	according to rule #1, #2, or #3, then the result of indenting each line		according to rule #1, #2, or #3, then the result of indenting each line
	of *L* by 1-3 spaces (the same for each line) also constitutes a		of *Ls* by 1-3 spaces (the same for each line) also constitutes a
	list item with the same contents and attributes. If a line is		list item with the same contents and attributes. If a line is
	empty, then it need not be indented.		empty, then it need not be indented.
	缩进一个空格		缩进一个空格
	.		.
	1. A paragraph		1. A paragraph
	with two lines.		with two lines.
	indented code		indented code
	skipping to change at line 4245		skipping to change at line 4246
	对应码位。		对应码位。
	.		.
	&nbsp; &amp; &copy; &AElig; &Dcaron; &frac34; &HilbertSpace; &DifferentialD; &ClockwiseContourIntegral;		&nbsp; &amp; &copy; &AElig; &Dcaron; &frac34; &HilbertSpace; &DifferentialD; &ClockwiseContourIntegral;
	.		.
	<p>  &amp; © Æ Ď ¾ ℋ ⅆ ∲</p>		<p>  &amp; © Æ Ď ¾ ℋ ⅆ ∲</p>
	.		.
	[十进制实体](@decimal-entities)		[十进制实体](@decimal-entities)
	由 `&#` + 1-8 个阿拉伯数字字符串 + `;` 组成。同样，这些		由 `&#` + 1-8 个阿拉伯数字字符串 + `;` 组成。同样，这些
	entities need to be recognised and tranformed into their corresponding		entities need to be recognised and transformed into their corresponding
	UTF8 codepoints. Invalid Unicode codepoints will be written as the		unicode codepoints. Invalid unicode codepoints will be written as the
	"unknown codepoint" character (`0xFFFD`)		"unknown codepoint" character (`0xFFFD`)
	.		.
	&#35; &#1234; &#992; &#98765432;		&#35; &#1234; &#992; &#98765432;
	.		.
	<p># Ӓ Ϡ �</p>		<p># Ӓ Ϡ �</p>
	.		.
	[十六进制实体](@hexadecimal-entities)		[十六进制实体](@hexadecimal-entities)
	+ 1-8 个十六进制数字字符串 + `;` 组成。它们也		+ 1-8 个十六进制数字字符串 + `;` 组成。它们也
	+ `;`. They will also be parsed and turned into their corresponding UTF8 values		+ `;`. They will also be parsed and turned into the corresponding
	in the AST.		unicode codepoints in the AST.
	.		.
	&#X22; &#XD06; &#xcab;		&#X22; &#XD06; &#xcab;
	.		.
	<p>&quot; ആ ಫ</p>		<p>&quot; ആ ಫ</p>
	.		.
	这里是一些非实体引用		这里是一些非实体引用
	.		.
	skipping to change at line 4551		skipping to change at line 4553
	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。
	首先，是一些定义。[分隔符序列](@delimiter-run)（delimiter run）是指		首先，是一些定义。[分隔符序列](@delimiter-run)（delimiter run）是指
	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
	`*` 字符，或者一个或多个 `_`		`*` 字符，或者一个或多个 `_`
	字符组成的序列，且其前后没有 `_` 字符。		字符组成的序列，且其前后没有 `_` 字符。
	一个 [左侧分隔符运行](@left-flanking-delimiter-run) 是		一个 [左侧分隔符运行](@left-flanking-delimiter-run) 是
	a [delimiter run] that is (a) not followed by [unicode whitespace],		a [delimiter run] that is (a) not followed by [unicode whitespace],
	并且 (b) 要么后面没有 [标点字符]，或者		并且 (b) 要么后面没有 [标点字符]，或者
	preceded by [unicode whitespace] or a [punctuation character] or		preceded by [unicode whitespace] or a [punctuation character].
	the beginning of a line.		For purposes of this definition, the beginning and the end of
			the line count as unicode whitespace.
	一个 [右侧分隔符运行](@right-flanking-delimiter-run) 是		一个 [右侧分隔符运行](@right-flanking-delimiter-run) 是
	a [delimiter run] that is (a) not preceded by [unicode whitespace],		a [delimiter run] that is (a) not preceded by [unicode whitespace],
	并且 (b) 要么前面没有 [标点字符]，或者		并且 (b) 要么前面没有 [标点字符]，或者
	followed by [unicode whitespace] or a [punctuation character] or		followed by [unicode whitespace] or a [punctuation character].
	the end of a line.		For purposes of this definition, the beginning and the end of
			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
	_abc		_abc
	**"abc"		**"abc"
	_"abc"		_"abc"
	```		```
	- right-flanking but not left-flanking		- right-flanking but not left-flanking
	```		```
	abc***		abc***
	abc_		abc_
	"abc"**		"abc"**
	_"abc"		"abc"_
	```		```
	- Both right and right-flanking		- Both left and right-flanking
	```		```
	abc***def		abc***def
	"abc"_"def"		"abc"_"def"
	```		```
	- Neither right nor right-flanking		- Neither left nor right-flanking
	```		```
	abc *** def		abc *** def
	a _ b		a _ b
	```		```
	(The idea of distinguishing left-flanking and right-flanking		(The idea of distinguishing left-flanking and right-flanking
	delimiter runs based on the character before and the character		delimiter runs based on the character before and the character
	之后来自 Roopesh Chander 的		之后来自 Roopesh Chander 的
	[vfmd](http://www.vfmd.org/vfmd-spec/specification/#procedure-for-identifying-em phasis-tags)。		[vfmd](http://www.vfmd.org/vfmd-spec/specification/#procedure-for-identifying-em phasis-tags)。
	vfmd 使用术语“强调指示字符串”而不是“分隔符		vfmd 使用术语“强调指示字符串”而不是“分隔符
	序列”，并且其区分左侧和右侧分隔序列的规则		序列”，并且其区分左侧和右侧分隔序列的规则
	比此处给出的规则要复杂一些。）		比此处给出的规则要复杂一些。）
	以下规则定义了强调和强强调。		以下规则定义了强调和强强调。
	1. 单个 `*` 字符 [可以开启强调](@can-open-emphasis)		1. 单个 `*` 字符 [可以开启强调](@can-open-emphasis)
	当且仅当它是 [左侧定界符序列] 的一部分时。		iff (if and only if) it is part of a [left-flanking delimiter run].
	2. 单个 `_` 字符 [可以开启强调] 当且仅当		2. 单个 `_` 字符 [可以开启强调] 当且仅当
	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 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 delimeter run]
			preceded by punctuation.
	3. 单个 `*` 字符 [可以关闭强调](@can-close-emphasis)		3. 单个 `*` 字符 [可以关闭强调](@can-close-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。
	4. A single `_` character [can close emphasis]		4. A single `_` character [can close emphasis] iff
	iff it is part of a [right-flanking delimiter run]		it is part of a [right-flanking delimiter run]
	and 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 delimeter run]
			followed by punctuation.
	5. 双 `**` [可以开启强强调](@can-open-strong-emphasis)		5. 双 `**` [可以开启强强调](@can-open-strong-emphasis)
	当且仅当它是 [左侧定界符序列] 的一部分时。		当且仅当它是 [左侧定界符序列] 的一部分时。
	6. A double `__` [can open strong emphasis]		6. A double `__` [can open strong emphasis] iff
	iff it is part of a [left-flanking delimiter run]		它是 [左侧定界符序列] 的一部分
	and 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 delimeter run]
			preceded by punctuation.
	7. 双 `**` [可以关闭强强调](@can-close-strong-emphasis)		7. 双 `**` [可以关闭强强调](@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. 双 `__` [可以关闭强强调]
	iff it is part of a [right-flanking delimiter run]		it is part of a [right-flanking delimiter run]
	and 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 delimeter run]
			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
	字符（`_` 或 `*`）作为起始分隔符。起始分隔符和		字符（`_` 或 `*`）作为起始分隔符。起始分隔符和
	结束分隔符之间必须有一个非空的内联序列；这些形成了强调		结束分隔符之间必须有一个非空的内联序列；这些形成了强调
	内联的内容。		内联的内容。
	内联。		内联。
	10. 强强调以一个		10. 强强调以一个
	[可以开启强强调] 的定界符开始，并以一个定界符结束		[可以开启强强调] 的定界符开始，并以一个定界符结束
	skipping to change at line 4792		跳至更改处 第 4804 行
	此处 `_` 不会生成强调，因为第一个定界符序列		此处 `_` 不会生成强调，因为第一个定界符序列
	是右侧定界符序列，而第二个是左侧定界符序列		是右侧定界符序列，而第二个是左侧定界符序列
	.		.
	aa_"bb"_cc		aa_"bb"_cc
	.		.
	<p>aa_&quot;bb&quot;_cc</p>		<p>aa_&quot;bb&quot;_cc</p>
	.		.
	Here there is no emphasis, because the delimiter runs are		This is emphasis, even though the opening delimiter is
	both left- and right-flanking:		both left- and right-flanking, because it is preceded by
			标点符号
	.		.
	"aa"_"bb"_"cc"		foo-_(bar)_
	.		.
	<p>&quot;aa&quot;_&quot;bb&quot;_&quot;cc&quot;</p>		<p>foo-<em>(bar)</em></p>
	.		.
	规则 3		规则 3
	这不是强调，因为关闭的定界符		这不是强调，因为关闭的定界符
	不匹配开启的定界符		不匹配开启的定界符
	.		.
	_foo*		_foo*
	.		.
	skipping to change at line 4908		skipping to change at line 4921
	.		.
	<p>_пристаням_стремятся</p>		<p>_пристаням_стремятся</p>
	.		.
	.		.
	_foo_bar_baz_		_foo_bar_baz_
	.		.
	<p><em>foo_bar_baz</em></p>		<p><em>foo_bar_baz</em></p>
	.		.
			This is emphasis, even though the closing delimiter is
			左右两侧都有，因为它后面跟着
			标点符号
			.
			_(bar)_.
			.
			<p><em>(bar)</em>.</p>
			.
	规则 5		规则 5
	.		.
	**foo bar**		**foo bar**
	.		.
	<p><strong>foo bar</strong></p>		<p><strong>foo bar</strong></p>
	.		.
	This is not strong emphasis, because the opening delimiter is		This is not strong emphasis, because the opening delimiter is
	后跟空白字符		后跟空白字符
	skipping to change at line 5004		skipping to change at line 5027
	.		.
	<p>пристаням__стремятся__</p>		<p>пристаням__стремятся__</p>
	.		.
	.		.
	__foo, __bar__, baz__		__foo, __bar__, baz__
	.		.
	<p><strong>foo, <strong>bar</strong>, baz</strong></p>		<p><strong>foo, <strong>bar</strong>, baz</strong></p>
	.		.
			这是强强调，尽管起始分隔符是
			左右两侧都有，因为它前面是
			标点符号
			.
			foo-_(bar)_
			.
			<p>foo-<em>(bar)</em></p>
			.
	规则 7		规则 7
	这不是强强调，因为结束分隔符前面有		这不是强强调，因为结束分隔符前面有
	空格		空格
	.		.
	**foo bar **		**foo bar **
	.		.
	<p>**foo bar **</p>		<p>**foo bar **</p>
	.		.
	skipping to change at line 5107		skipping to change at line 5140
	.		.
	<p>__пристаням__стремятся</p>		<p>__пристаням__стремятся</p>
	.		.
	.		.
	__foo__bar__baz__		__foo__bar__baz__
	.		.
	<p><strong>foo__bar__baz</strong></p>		<p><strong>foo__bar__baz</strong></p>
	.		.
			这是强强调，尽管结束分隔符是
			左右两侧都有，因为它后面跟着
			标点符号
			.
			_(bar)_.
			.
			<p><em>(bar)</em>.</p>
			.
	规则 9		规则 9
	任何非空的行内元素序列都可以作为		任何非空的行内元素序列都可以作为
	强调跨度的内容。		强调跨度的内容。
	.		.
	*foo [bar](/url)*		*foo [bar](/url)*
	.		.
	<p><em>foo <a href="/url">bar</a></em></p>		<p><em>foo <a href="/url">bar</a></em></p>
	.		.
	skipping to change at line 5668		skipping to change at line 5711
	A [link destination](@link-destination) consists of either		A [link destination](@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 line breaks or unescaped `<` or `>`		closing `>` that contains no line breaks or unescaped `<` or `>`
	characters, 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 that is not itself
	inside a balanced pair of unescaped paretheses.		inside a balanced pair of unescaped parentheses.
	A [link title](@link-title) consists of either		A [link title](@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 5801		skipping to change at line 5844
	in Markdown		in Markdown
	.		.
	[link](foo\)\:)		[link](foo\)\:)
	.		.
	<p><a href="foo):">link</a></p>		<p><a href="foo):">link</a></p>
	.		.
	URL 转义在目的地内部应保持原样，因为所有		URL 转义在目的地内部应保持原样，因为所有
	URL 转义字符也是有效的 URL 字符。目的地中的 HTML 实体		URL 转义字符也是有效的 URL 字符。目的地中的 HTML 实体
	the destination will be parsed into their UTF-8 codepoints, as usual, and		the destination will be parsed into the corresponding unicode
	optionally URL-escaped when written as HTML.		codepoints, as usual, and optionally URL-escaped when written as HTML.
	.		.
	[link](foo%20b&auml;)		[link](foo%20b&auml;)
	.		.
	<p><a href="foo%20b%C3%A4">link</a></p>		<p><a href="foo%20b%C3%A4">link</a></p>
	.		.
	注意，由于标题通常可以被解析为目的地，		注意，由于标题通常可以被解析为目的地，
	如果你尝试省略目的地而保留标题，你会		如果你尝试省略目的地而保留标题，你会
	得到意想不到的结果。		得到意想不到的结果。
	skipping to change at line 7175		skipping to change at line 7218
	.		.
	### foo		### foo
	.		.
	<h3>foo</h3>		<h3>foo</h3>
	.		.
	## Soft line breaks		## Soft line breaks
	A regular line break (not in a code span or HTML tag) that is not		A regular line break (not in a code span or HTML tag) that is not
	preceded by two or more spaces is parsed as a softbreak. (A		preceded by two or more spaces or a backslash is parsed as a
	softbreak may be rendered in HTML either as a		softbreak. (A softbreak may be rendered in HTML either as a
	[line ending] or as a space. The result will be the same		[line ending] or as a space. The result will be the same in
	in browsers. In the examples here, a [line ending] will be used.)		browsers. In the examples here, a [line ending] will be used.)
	.		.
	foo		foo
	baz		baz
	.		.
	<p>foo		<p>foo
	baz</p>		baz</p>
	.		.
	Spaces at the end of the line and beginning of the next line are		Spaces at the end of the line and beginning of the next line are
End of changes. 33 change blocks.
	49 lines changed or deleted		91 lines changed or added
此 HTML 差异由 rfcdiff 1.41 生成。最新版本可从 http://tools.ietf.org/tools/rfcdiff/ 获取