blocks|key|253290|text|根据W3C+specification+for+links+HTML4的说法:不。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|253291|由A元素定义的|253292|链接和锚点不得嵌套；A元素不得包含任何其他A元素。|blockquote|253293|253294|253295|或者在HTML5+spec中|253296|253297|链接是由、area和link元素创建的概念性构造，表示两个资源之间的连接。|253298|253299|entityMap|0|LINK|mutability|MUTABLE|url|http://www.w3.org/TR/html4/struct/links.html#h-12.2.2|1|http://www.w3.org/TR/html5/links.html#links^0|2|X|0|0|0|0|0|0|3|A|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@$A|11|B|12|1|13]]|C|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|15|8|@]|9|@]|C|$]]|$1|I|3|-4|5|6|7|16|8|@]|9|@]|C|$]]|$1|J|3|-4|5|6|7|17|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|18|8|@]|9|@$A|19|B|1A|1|1B]]|C|$]]|$1|M|3|-4|5|6|7|1C|8|@]|9|@]|C|$]]|$1|N|3|O|5|H|7|1D|8|@]|9|@]|C|$]]|$1|P|3|-4|5|6|7|1E|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|1F|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]|Y|$5|T|U|V|C|$W|Z]]]]

According to the <a href="http://www.w3.org/TR/html4/struct/links.html#h-12.2.2" rel="noreferrer">W3C specification for links HTML4</a>: No.

<blockquote>
 Links and anchors defined by the A element must not be nested; an A element must not contain any other A elements.
</blockquote>

Or, in <a href="http://www.w3.org/TR/html5/links.html#links" rel="noreferrer">HTML5 spec</a>:

<blockquote>
 Links are a conceptual construct, created by a, area, and link elements, that represent a connection between two resources. 
</blockquote>

blocks|key|248227|text|根据W3C+specification+for+links+HTML5的说法:不。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|248228|248229|+内容模型：|blockquote|style|BOLD|248230|248231|Transparent，但不能有interactive+content后代。|248232|entityMap|0|LINK|mutability|MUTABLE|url|http://www.w3.org/TR/html5/text-level-semantics.html#the-a-element|1|http://www.w3.org/TR/html5/content-models.html#transparent|2|http://www.w3.org/TR/html5/content-models.html#interactive-content^0|2|X|0|0|0|1|5|0|0|0|B|1|G|J|2|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|-4|5|6|7|12|8|@]|9|@]|C|$]]|$1|E|3|F|5|G|7|13|8|@$A|14|B|15|H|I]]|9|@]|C|$]]|$1|J|3|-4|5|6|7|16|8|@]|9|@]|C|$]]|$1|K|3|L|5|6|7|17|8|@]|9|@$A|18|B|19|1|1A]|$A|1B|B|1C|1|1D]]|C|$]]|$1|M|3|-4|5|6|7|1E|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]|U|$5|P|Q|R|C|$S|V]]|W|$5|P|Q|R|C|$S|X]]]]

According to the <a href="http://www.w3.org/TR/html5/text-level-semantics.html#the-a-element" rel="noreferrer">W3C specification for links HTML5</a>: No.

<blockquote>
 Content model: 
 <a href="http://www.w3.org/TR/html5/content-models.html#transparent" rel="noreferrer">Transparent</a>, but there must be no <a href="http://www.w3.org/TR/html5/content-models.html#interactive-content" rel="noreferrer">interactive content</a> descendant.
</blockquote>

blocks|key|2929608|text|不能，您不能在HTML4或5中嵌套a元素。规范中阐明这一点的关键部分是，当a是一个链接时，它就是交互式内容，而a的内容模型是|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2929609|2929610|+Transparent，但不能有interactive+content后代|blockquote|2929611|2929612|2929613|Reference|2929614|entityMap|0|LINK|mutability|MUTABLE|url|http://www.w3.org/TR/html5/content-models.html#transparent|1|http://www.w3.org/TR/html5/content-models.html#interactive-content|2|http://www.w3.org/TR/html5/text-level-semantics.html#the-a-element^0|H|1|11|1|1J|1|0|0|1|B|0|H|J|1|0|0|0|0|9|2|0^^$0|@$1|2|3|4|5|6|7|Z|8|@$9|10|A|11|B|C]|$9|12|A|13|B|C]|$9|14|A|15|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|16|8|@]|D|@]|E|$]]|$1|G|3|H|5|I|7|17|8|@]|D|@$9|18|A|19|1|1A]|$9|1B|A|1C|1|1D]]|E|$]]|$1|J|3|-4|5|6|7|1E|8|@]|D|@]|E|$]]|$1|K|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|1G|8|@]|D|@$9|1H|A|1I|1|1J]]|E|$]]|$1|N|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U]]|V|$5|Q|R|S|E|$T|W]]|X|$5|Q|R|S|E|$T|Y]]]]

No, you cannot nest <code>a</code> elements in HTML 4 or 5. The key part of the spec that clarifies this is that when an <code>a</code> is a link, it is interactive content, and the content model of the <code>a</code> is

<blockquote>
 <a href="http://www.w3.org/TR/html5/content-models.html#transparent" rel="noreferrer">Transparent</a>, but there must be no <a href="http://www.w3.org/TR/html5/content-models.html#interactive-content" rel="noreferrer">interactive content</a> descendent
</blockquote>

<a href="http://www.w3.org/TR/html5/text-level-semantics.html#the-a-element" rel="noreferrer">Reference</a>

blocks|key|249903|text|即使在HTML5上也是不允许的.|type|unstyled|depth|inlineStyleRanges|entityRanges|data|249904|查看此处：HTML5+draft+at+W3C|offset|length|249905|249906|元素可以围绕整个段落、列表、表格等等，甚至整个部分，只要其中没有交互内容(例如按钮或其他链接)。|blockquote|249907|249908|entityMap|0|LINK|mutability|MUTABLE|url|http://www.w3.org/TR/html5/text-level-semantics.html#the-a-element^0|0|5|I|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Even on HTML5 it's not allowed...

See here: <a href="http://www.w3.org/TR/html5/text-level-semantics.html#the-a-element" rel="noreferrer" title="HTML5 draft">HTML5 draft at W3C</a>

<blockquote>
 The a element may be wrapped around entire paragraphs, lists, tables, and so forth, even entire sections, so long as there is no interactive content within (e.g. buttons or other links). 
</blockquote>

If I had a link to another page, and another link was put inside it, would that be ok to do? Is it allowed in HTML5 and if so, which browsers support it?

Trying this in Chrome 14.0.835.202, I see the text on the left gets linked, followed by the <code>#1</code> link, but the rest doesn't get linked.

Example:

<pre><code>&lt;p&gt;
 &lt;a href="download?file=2"&gt;Example file.txt&lt;/a&gt;
 [
 &lt;a href="revision?file=2&amp;id=8"&gt;This is an example revision that fixes bug 
 &lt;a href="bug?file=2&amp;id=1"&gt;#1&lt;/a&gt;. 
 Version number updated.
 &lt;/a&gt;
 ]
&lt;/p&gt;
</code></pre>

Is it ok to have an `<a>` inside another `<a>`?

HTML5

如果我有一个到另一个页面的链接，并且在里面放了另一个链接，这样做可以吗？在HTML5中允许吗?如果允许，哪些浏览器支持它？在Chrome14.0.835.202中尝试一下，我看到左边的文本被链接了，然后是#1链接，但其余的没有链接。示例： <a href="download?file=2">Example fil...

问在另一个`<a>`中包含一个`<a>`可以吗？
EN

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问在另一个`<a>`中包含一个`<a>`可以吗？
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