
w3.org
https://www.w3.org/2005/05/font-size-test/starhtml…
Language tags in HTML and XML
Language tags can be (and should be) used to indicate the language of text in HTML and XML documents. For HTML 4, language tags are specified with the lang attribute. For XML, language tags are given in the xml:lang attribute. In both cases, language information is inherited along the document hierarchy, i.e. it has to be given only once if the whole document is in one language, and language ...