HTML <blockquote> Tag
Define a block reference taken from another source:
Definition and Usage
<blockquote> The tag definition is taken from a block reference from another source.
Browsers usually respond to <blockquote> Elements are indented.
Differences Between HTML 4.01 and HTML5
in HTML 4.01 中，<blockquote> A tag defines a long reference.
in HTML5 中，<blockquote> The tag definition is taken from a block reference from another source.
Differences between HTML and XHTML
Note: If you need to validate your page as XHTML, then <blockquote> Element must contain block-level elements, such as:
<blockquote> <p>This is a long reference, this is a long reference. </p> </blockquote>