The BLOCKQUOTE element allows text quoted from another source to be rendered specially.
A typical rendering might be a slight extra left and right indent, and/or italic font. BLOCKQUOTE causes a paragraph break, and typically a line or so of white space will be allowed between it and any text before or after it.
Single-font rendition may for example put a vertical line of ">" characters down the left margin to indicate quotation in the Internet mail style.
I think it ends <BLOCKQUOTE>Soft you now, the fair Ophelia. Nymph, in thy orisons, be all my sins remembered. </BLOCKQUOTE> but I am not sure.