Related HTML elements include the <q> and <cite> tags for shorter, probably in-line, quotations and for citations respectively. An HTML attribute specific to the <blockquote> and <q> tags is cite= where the provenance of the material quoted may be given. If the quotation is in a language other than that of the main document, lang= and maybe dir= attributes may be relevant to specify the language of the quoted text and perhaps its direction, left-to-right or right-to-left. class= may be used for semantic or styling purposes.
In many Wiki markup languages, the semantics and effect of HTML <blockquote> is different from the use of an initial colon in a paragraph, which may be translated into an HTML dd element enclosed within a dl element. (That is a "data definition" within a "definition list", without there being any preceding "data term" or dt element).
"4.4.4 The blockquote element — HTML5". World Wide Web Consortium. Retrieved 11 November 2015. http://www.w3.org/TR/html5/grouping-content.html#the-blockquote-element ↩
HTML definition of ‘blockquote’ http://www.w3.org/TR/html401/struct/text.html#edef-BLOCKQUOTE ↩