QW-ACT-R05 HTML lang-attributtet har gyldig innhald

Testar på krav:

• 3.1.1 Språk på siden

Innhaldstype:

Krav til samsvar:

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
• is in a top-level browsing context; and
• has a node document with a content type of text/html.

Expectation

For each test target, the lang attribute has a known primary language tag.

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. These methods are not supported by all assistive technologies. This rule assumes that these other methods are insufficient to satisfying Success Criterion 3.1.1: Language of Page.
• This rule assumes that user agents and assistive technologies can programmatically determine known primary language tags even if these do not conform to the RFC 5646 syntax.
• This rule assumes that only known primary language tags are enough to satisfy Success Criterion 3.1.1 Language of Page; this notably excludes grandfathered tags and ISO 639.2 three-letters codes, both having poor support in assistive technologies.