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When serving XHTML 1.x or polyglot pages as text/html, use both the lang attribute and the xml:lang attribute together every time you want to set the language. The xml:lang attribute is the standard way to identify language information in XML.
The lang (or sometimes the xml:lang) attribute specifies the natural language of the content of a web page. An attribute on the html tag sets the language for all the text on the page. If part of the page uses text in a different language, you can add a language attribute with a different value to the element that surrounds that content.
Jul 7, 2011 · The xml:lang value applies to any sub-elements contained by the element. It also applies to attribute values associated with the element and sub-elements (though using natural language in attributes is not best practice). The value of the xml:lang attribute is a language tag defined by BCP 47. For example, here is xml:lang on an element t:
XHTML 1.0 uses language tags in the HTML lang attribute and the XML xml:lang attribute, as well as the hreflang attribute. HTTP uses language tags in the Accept-Language and Content-Language headers. SMIL and SVG can use language tags in the switch statement. CSS and XSL use language tags for detailed style control.
The lang and xml:lang attributes; RFC 5646: Tags for Identifying Languages; Accessibility Support. There are differences in how assistive technologies handle unknown and invalid language tags. Some will default to the language of the page, whereas others will default to the closest ancestor with a valid lang attribute.
The lang attribute set for the element itself. The closest parent element that has the lang attribute set (i.e., the lang attribute is inherited). The HTTP "Content-Language" header (which may be configured in a server). For example: Content-Language: en-cockney User agent default values and user preferences.
This rule checks that the lang attribute of the root element of a non-embedded HTML page has a language tag with a known primary language subtag. Applicability. This rule applies to any document element if it is an html element for which all the following are true: has a lang attribute that is neither empty (“”) nor only ASCII whitespace; and
has a non-empty xml:lang attribute. Expectation. For each test target, the values of the primary language subtags, if any exist, for the lang and xml:lang attributes are the same. Assumptions. The language of the page can be set by other methods than the lang attribute, for example using HTTP headers or the meta element.
Aug 14, 2013 · Using :lang. Use of :lang is straightforward. If the document is parsed as HTML, the :lang selector will match content where the language was defined using a lang attribute value. However, if the document is parsed as XML, the :lang selector will match content labeled with an xml:lang attribute value and ignore any lang attribute value. Using ...
This rule checks that an HTML page has a non-empty lang attribute. Applicability. This rule applies to any document element if it is an html element for which all the following are true: is in a top-level browsing context; and; has a node document with a content type of text/html.
