blocks|key|2059287|text|由于之前的文档类型过于隐蔽，该标准已被简化。新的文档类型就是<!DOCTYPE+html>。您可能想知道为什么它不是<!DOCTYPE+html5>，但原因很简单，因为它只是对HTML标准的更新，而不是任何东西的新版本。正如您在下面看到的，所有元素现在都可以有一个language属性。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2059288|2059289|+<html>元素是文档的根元素。每个文档都必须以该元素开头，并且必须同时包含<head>和<body>元素。|blockquote|2059290|2059291|使用lang属性在此元素上指定文档的主要语言被认为是一种好的做法。|2059292|2059293|<!DOCTYPE+html>
<html+lang="en">
++++<head>
++++++++<meta+charset="utf-8">
++++++++<title>Hello+World</title>
++++</head>
++++<body>
++++++++<h1>Hello+World</h1>
++++++++
++++++++++++Jamie+was+here.
++++++++
++++</body>
</html>|code-block|syntax|javascript|2059294|更多信息：https://dev.w3.org/html5/html-author/#doctype-declaration|2059295|entityMap|0|LINK|mutability|MUTABLE|url|https://dev.w3.org/html5/html-author/#doctype-declaration^0|U|F|1M|G|0|0|1|6|13|6|1A|6|0|0|0|0|0|5|1L|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|17|8|@]|D|@]|E|$]]|$1|G|3|H|5|I|7|18|8|@$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]|$9|1D|A|1E|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]|$1|K|3|L|5|6|7|1G|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|1H|8|@]|D|@]|E|$]]|$1|N|3|O|5|P|7|1I|8|@]|D|@]|E|$Q|R]]|$1|S|3|T|5|6|7|1J|8|@]|D|@$9|1K|A|1L|1|1M]]|E|$]]|$1|U|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]]]

The standard has been simplified because the previous doctypes were too cryptic. The new doctype is simply <code>&lt;!DOCTYPE html&gt;</code> . You may wonder why it is not <code>&lt;!DOCTYPE html5&gt;</code> but it is simply because it is just an update to the standard of HTML and not a new version of anything. As you can see below, all elements can now have a language attribute.

<blockquote>
 The <code>&lt;html&gt;</code> element is the root element of a document. Every document
 must begin with this element, and it must contain both the <code>&lt;head&gt;</code> and
 <code>&lt;body&gt;</code> elements.
 
 It is considered good practice to specify the primary language of the
 document on this element using the lang attribute.
</blockquote>

<pre><code>&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
 &lt;head&gt;
 &lt;meta charset="utf-8"&gt;
 &lt;title&gt;Hello World&lt;/title&gt;
 &lt;/head&gt;
 &lt;body&gt;
 &lt;h1&gt;Hello World&lt;/h1&gt;
 &lt;p&gt;
 Jamie was here.
 &lt;/p&gt;
 &lt;/body&gt;
&lt;/html&gt;
</code></pre>

More info: <a href="https://dev.w3.org/html5/html-author/#doctype-declaration">https://dev.w3.org/html5/html-author/#doctype-declaration</a>

blocks|key|5587118|text|您只需使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5587119|<!DOCTYPE+html>+
<html>
</html>|code-block|syntax|javascript|5587120|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

you just use

<pre><code>&lt;!DOCTYPE html&gt; 
&lt;html&gt;
&lt;/html&gt;
</code></pre>

blocks|key|4169633|text|首先，html5文档类型不区分大小写。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|4169634|这三种方法中的任何一种都可以工作：|4169635|1)+<!DOCTYPE+html>|CODE|4169636|2)+<!DOCTYPE+HTML>|4169637|3)+<!doctype+html>|4169638|您可以检查here.的有效性|4169639|entityMap|0|LINK|mutability|MUTABLE|url|https://validator.w3.org/#validate_by_input^0|3|F|0|0|3|F|0|3|F|0|3|F|0|5|5|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|12|8|@$9|13|A|14|B|J]]|D|@]|E|$]]|$1|K|3|L|5|6|7|15|8|@$9|16|A|17|B|J]]|D|@]|E|$]]|$1|M|3|N|5|6|7|18|8|@$9|19|A|1A|B|J]]|D|@]|E|$]]|$1|O|3|P|5|6|7|1B|8|@]|D|@$9|1C|A|1D|1|1E]]|E|$]]|$1|Q|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

First of all, html5 doctype is not case sensitive. 

Either one of these three will work:

1) <code>&lt;!DOCTYPE html&gt;</code>

2) <code>&lt;!DOCTYPE HTML&gt;</code>

3) <code>&lt;!doctype html&gt;</code>

You can check the validity <a href="https://validator.w3.org/#validate_by_input" rel="noreferrer">here.</a>

blocks|key|4169507|text|它很简单，就像|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4169508|+<!DOCTYPE+html>|code-block|syntax|javascript|4169509|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

It's as simple as 

<pre><code> &lt;!DOCTYPE html&gt;
</code></pre>

blocks|key|5587296|text|根据负责制定当前web标准的组织WWW+Consortium的说法，没有人正确地回答了这个问题。当前的语言声明标准是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5587297|5587298|+始终在标记上使用language属性来声明页面中文本的默认语言。当页面包含其他语言的内容时，将语言属性添加到该内容周围的元素中。对于充当HTML的页面使用lang属性，对于充当XML的页面使用xml:lang属性。对于XHTML1.x和HTML5多语言文档，请同时使用这两者。|blockquote|offset|length|style|BOLD|5587299|5587300|W3C+HTML+Language+Tag+Page|5587301|5587302|以下是关于DOCTYPE声明的答案|5587303|5587304|使用以下标记作为模板，使用适当的Doctype声明创建新的文档。如果您希望使用其他DTD，请参阅下面的列表。|5587305|5587306|W3C+DOCTYPE+Standards|5587307|5587308|<!DOCTYPE+html>
<html>

<head>
++++<title>An+HTML+standard+template</title>
++++<meta+charset="utf-8"++/>
</head>

<body>
+++++…+Your+HTML+content+here+…
</body>
</html>|code-block|syntax|javascript|5587309|希望这能有所帮助。|5587310|entityMap|0|LINK|mutability|MUTABLE|url|https://www.w3.org/International/questions/qa-html-language-declarations|1|https://www.w3.org/QA/2002/04/valid-dtd-list.html^0|0|0|1|3|0|0|0|Q|0|0|0|0|0|0|0|0|L|1|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|1F|8|@$F|1G|G|1H|H|I]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|1J|8|@]|9|@$F|1K|G|1L|1|1M]]|A|$]]|$1|M|3|-4|5|6|7|1N|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|1O|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]|$1|Q|3|R|5|E|7|1Q|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1R|8|@]|9|@]|A|$]]|$1|T|3|U|5|6|7|1S|8|@]|9|@$F|1T|G|1U|1|1V]]|A|$]]|$1|V|3|-4|5|6|7|1W|8|@]|9|@]|A|$]]|$1|W|3|X|5|Y|7|1X|8|@]|9|@]|A|$Z|10]]|$1|11|3|12|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|13|3|-4|5|6|7|1Z|8|@]|9|@]|A|$]]]|14|$15|$5|16|17|18|A|$19|1A]]|1B|$5|16|17|18|A|$19|1C]]]]

According to the WWW Consortium, the organization responsible setting current web standards, no one has answered this correctly.
The current standard for language declaration is

<blockquote>
 Always use a language attribute on the html tag to declare the default
 language of the text in the page. When the page contains content in another
 language, add a language attribute to an element surrounding that content.
 Use the lang attribute for pages served as HTML, and the xml:lang attribute 
 for pages served as XML. For XHTML 1.x and HTML5 polyglot documents, use both 
 together. 
 <a href="https://www.w3.org/International/questions/qa-html-language-declarations" rel="nofollow noreferrer">W3C HTML Language Tag Page</a>
</blockquote>

Here is the answer regarding DOCTYPE declaration

<blockquote>
 Use the following markup as a template to create a new HTML document using a 
 proper Doctype declaration. See the list below if you wish to use another DTD. 
 <a href="https://www.w3.org/QA/2002/04/valid-dtd-list.html" rel="nofollow noreferrer">W3C DOCTYPE Standards</a>
</blockquote>

<pre><code>&lt;!DOCTYPE html&gt;
&lt;html&gt;

&lt;head&gt;
 &lt;title&gt;An HTML standard template&lt;/title&gt;
 &lt;meta charset="utf-8" /&gt;
&lt;/head&gt;

&lt;body&gt;
 &lt;p&gt;… Your HTML content here …&lt;/p&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>

Hope this helps.

blocks|key|4169502|text|你用了..。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4169503|<!DOCTYPE+html>+|code-block|syntax|javascript|4169504|然后是你的HTML标签等等。|4169505|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You use...

<pre><code>&lt;!DOCTYPE html&gt; 
</code></pre>

followed by your HTML tag etc..

blocks|key|5587222|text|你只需要这样：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5587223|<!DOCTYPE+html>+
<html>
...|code-block|syntax|javascript|5587224|这里有几点。所有浏览器都支持这一点，甚至像IE6/IE7这样的老浏览器也是如此。实际上，所有浏览器都需要doctype声明中的"html“部分才能跳转到标准模式。|5587225|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You only need this:

<pre><code>&lt;!DOCTYPE html&gt; 
&lt;html&gt;
...
</code></pre>

There are several points here. This is supported by all browsers, even old ones like IE6/IE7. All browsers actually nee "html" part from doctype declaration to jump into standards mode.

blocks|key|2059218|text|
<!doctype+html>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2059219|学习资源：|unstyled|offset|length|style|BOLD|2059220|2059221|http://diveintohtml5.info/|unordered-list-item|2059222|http://www.html5doctor.com|2059223|2059224|entityMap|0|LINK|mutability|MUTABLE|url|1|http://www.html5doctor.com/^0|0|0|5|0|0|0|Q|0|0|0|Q|1|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|11|8|@$G|12|H|13|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|14|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|15|8|@]|9|@$G|16|H|17|1|18]]|A|$]]|$1|O|3|P|5|N|7|19|8|@]|9|@$G|1A|H|1B|1|1C]]|A|$]]|$1|Q|3|-4|5|F|7|1D|8|@]|9|@]|A|$]]|$1|R|3|-4|5|F|7|1E|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|M]]|Y|$5|U|V|W|A|$X|Z]]]]

<pre><code>&lt;!-- simplified doctype works for all previous versions of HTML as well --&gt;
&lt;!doctype html&gt;
</code></pre>

Learning Resource:

<ul>
<li><a href="http://diveintohtml5.info/" rel="nofollow">http://diveintohtml5.info/</a></li>
<li><a href="http://www.html5doctor.com" rel="nofollow">http://www.html5doctor.com</a> </li>
</ul>

blocks|key|5587251|text|开始标记<html>在HTML5中是可选的，就像在HTML4.01中一样。如果使用，它必须是第一个标记。它有不同的可选属性:+HTML5的全局属性和特殊的manifest属性。<html>标记中最常用的有用属性是lang属性。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5587252|(+doctype声明是完全不同的东西，根本不是一个标记。)|5587253|entityMap^0|4|6|25|8|2G|6|2Y|4|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|S|8|@]|D|@]|E|$]]|$1|H|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|I|$]]

The start tag <code>&lt;html&gt;</code> is optional in HTML5, as in HTML 4.01. If used, it must be the first tag. It has different optional attributes: the global attributes of HTML5, and the special <code>manifest</code> attribute. The most common useful attribute in the <code>&lt;html&gt;</code> tag is the <code>lang</code> attribute.

(The doctype declaration is something quite different, and not a tag at all.)

blocks|key|5587350|text|对于该标准所说的内容，最清晰、最明确的答案似乎是HTML+5.3，请访问：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5587351|http://w3c.github.io/html/syntax.html#the-doctype|offset|length|5587352|特别要注意列表项1和3，它们指定doctype语句是不区分大小写的。另请注意，语句中的空格数量可能会有所不同。|5587353|并注意"A+DOCTYPE是一个必需的前言“这一条款。|5587354|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|1D|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@$D|S|E|T|1|U]]|A|$]]|$1|F|3|G|5|6|7|V|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|W|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|C]]]]

The clearest most definitive answer of what the standard says seems to be for HTML 5.3 at:

<a href="http://w3c.github.io/html/syntax.html#the-doctype" rel="nofollow noreferrer">http://w3c.github.io/html/syntax.html#the-doctype</a>

Note especially the list-items 1 and 3 which specify that the doctype-statement is case-insensitive. Also note the number of spaces inside the statement can vary. 

And note the clause "A DOCTYPE is a required preamble."

What is the correct way to use start tag when creating with HTML5

IE: HTML 4 Strict is like this

<pre><code>&lt;!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"&gt; 
</code></pre>

What is the correct way to declare an HTML5 Doctype.

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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使用HTML5创建时，正确使用开始标记的方法是什么例如:HTML4Strict是这样的<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

问声明HTML5文档类型的正确方法是什么？
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