Two tags all represent "references".
What is different is that the Q tag is an inline element, with "" at the beginning and end of the content, and Blockquote is a block-level element, with a default of about 40px of outer space, without "".
Semantically, the former refers to a small paragraph of text, the latter refers to a large segment of the content block.
In terms of compatibility, the Q tag under IE67 does not have "". The quotation marks under FF are nice full-width characters: "". And Chrome is the half-width character: "". As for IE89, should also be full-width characters, but in the case of not specifying the font is really ugly, in the designation of the song or Microsoft Black after the appearance of the FF and the same.
Related extensions:
The cite attribute specifies the source of the reference.
The value of this property is a URL that is enclosed in quotation marks and points to an online document, and, if possible, refers to the exact location in the document. Say:
cite="http://www.wwf.org">WWF ' s ultimate goal is to build a future where people live in harmony with nature.</blockquote>
The cite property is not supported by mainstream browsers. However, search engines may use this property to obtain more information about the reference.
HTML Tags <q> <blockquote>