Pseudo-class: lang

Support Key: CSS2
Other CSS Pseudo-Classes
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HTML Equivalent:
What is it?
It is possible to specify the particular language in use for a document or even a particular element. In HTML there is the common LANG attribute available, the META element charset values and special HTTP headers, all allowing an author to specify the human language of the content. In XML, there is the common 'xml:lang' attribute.

The :lang Pseudo-element in CSS creates a selector that can address content according to the human language it is encoded in. It takes as a value a string that identifies a language system used for communication (with the exception of computer languages.) The syntax and registry of HTML language tags is identical to the system specified in RFC 1766.

A language tag is composed of one or more parts: A primary language tag and a possibly empty series of subtags:
   language-tag = [Primary Language Tag] ("-" [Language Subtag])*
   [Primary Language Tag] = "i" (for IANA defined languages) | "x" (custom/private use language) | [ISO 639 2-letter Language Code]
   [Language Subtag] = [ISO 3166 2-letter country code] | [dialect or other locale/situation specific language]
Language tags are case-insensitive and spaces are not allowed. The registering of language tags is administered by the Internet Assigned Numbers Authority (IANA). Example language tags include en, en-US, and x-pig-latin
Ext/Doc: blockquote:lang(fr) { quotes: ' ' ' ' }
   (Sets the 'quotes' property on French BLOCKQUOTE elements to use French quotation marks.)
In-Line:  NA
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