HTML and CSS Reference
1 See www.iana.org/assignments/language-subtag-registry for a list of language codes; the “sub-
tags” shown are what you would use.
Note There is an additional set of global attributes that apply when microdata is used,
which allows additional markup to be added to the elements on a page to make it easier
for machines, such as search engine algorithms, to parse and use the content. Microdata
will be discussed later in the topic.