内容语言的 HTML 元标记
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HTML meta tag for content language
提问by byneri
What is the difference between the following two HTML meta tags, for specifying spanish web page content:
以下两个 HTML 元标记之间的区别是什么，用于指定西班牙语网页内容：
<meta name="language" content="Spanish">
and
和
<meta http-equiv="content-language" content="es">
回答by Quentin
<meta name="language" content="Spanish">
<meta name="language" content="Spanish">
This isn't defined in any specification (including the HTML5 draft)
这在任何规范中都没有定义（包括HTML5 草案）
<meta http-equiv="content-language" content="es">
<meta http-equiv="content-language" content="es">
This is a poor man's version of a real HTTP header and should really be expressed in the headers. For example:
这是一个真正的 HTTP 标头的穷人版本，应该在标头中真正表达出来。例如：
Content-language: es
Content-type: text/html;charset=UTF-8
It says that the document is intended for Spanish language speakers (it doesn't, however mean the document is written in Spanish; it could, for example, be written in English as part of a language course for Spanish speakers).
它说该文件是为讲西班牙语的人准备的（但这并不意味着该文件是用西班牙语编写的；例如，它可以用英语编写，作为讲西班牙语的人的语言课程的一部分）。
从规范：
The Content-Language entity-header field describes the natural language(s) of the intended audience for the enclosed entity. Note that this might not be equivalent to all the languages used within the entity-body.
Content-Language 实体标题字段描述了封闭实体的预期受众的自然语言。请注意，这可能并不等同于实体正文中使用的所有语言。
If you want to state that a document is written in Spanish then use:
如果您想说明文档是用西班牙语编写的，请使用：
<html lang="es">
回答by dakab
You asked for differences, but you can't quite compare those two.
你要求差异，但你不能完全比较这两者。
Note that <meta http-equiv="content-language" content="es">is obsolete and removed in HTML5. It was used to specify “a document-wide default language”, with its http-equivattribute making it a pragma directive(which simulates an HTTP response header like Content-Languagethat hasn't been sent from the server, since it cannot override a real one).
请注意，<meta http-equiv="content-language" content="es">它已过时并已在 HTML5 中删除。它用于指定“文档范围的默认语言”，其http-equiv属性使其成为pragma 指令（模拟Content-Language尚未从服务器发送的 HTTP 响应标头，因为它无法覆盖真正的响应标头）。
Regarding <meta name="language" content="Spanish">, you hardly find any reliable information. It's non-standard and was probably invented as a SEO makeshift.
关于<meta name="language" content="Spanish">，你几乎找不到任何可靠的信息。它是非标准的，可能是作为SEO 临时发明的。
However, the HTML5 W3C Recommendationencourages authors to use the langattribute on htmlroot elements (attribute values must be valid BCP 47 language tags):
但是，HTML5 W3C 建议鼓励作者lang在html根元素上使用属性（属性值必须是有效的BCP 47 语言标签）：
<!DOCTYPE html>
<html lang="es-ES">
<head>
…
Anyway, if you want to specify the content language to instruct search engine robots, you should consider this quote from Google Search Console Help on multilingual sites:
无论如何，如果您想指定内容语言来指示搜索引擎机器人，您应该考虑多语言网站上来自Google Search Console Help 的引用：
Google uses only the visible content of your page to determine its language. We don't use any code-level language information such as
langattributes.
Google 仅使用您网页的可见内容来确定其语言。我们不使用任何代码级语言信息，例如
lang属性。
回答by gojeg
Google recommends to use hreflang, read more info
谷歌推荐使用hreflang，阅读更多信息
Examples:
例子：
<link rel="alternate" href="http://example.com/en-ie" hreflang="en-ie" />
<link rel="alternate" href="http://example.com/en-ca" hreflang="en-ca" />
<link rel="alternate" href="http://example.com/en-au" hreflang="en-au" />
<link rel="alternate" href="http://example.com/en" hreflang="en" />
回答by zoladp
Html5 also recommend to use <html lang="es-ES">The small letter lang tag only specifies: language code
The large letter specifies: country code
Html5也推荐使用<html lang="es-ES">小写字母lang标签只指定：语言代码 大写字母指定：国家代码
This is really useful for ie.Chrome, when the browser is proposing to translate web content(ie google translate)
这对于 ie.Chrome 非常有用，当浏览器建议翻译网页内容时（即谷歌翻译）
