<BLOCKQUOTE> ... </BLOCKQUOTE> is used to set off quoted material from external sources. Typical rendering is an left and right indention and possibly an italic font.
None.
<BLOCKQUOTE> ... </ BLOCKQUOTE > is legal within:
<BLOCKQUOTE> <BODY> <DD> <FORM> <LI>
The following markup can be used within <BLOCKQUOTE> ... </BLOCKQUOTE>
<ADDRESS> <BLOCKQUOTE> <DIR> <DL> <FORM> <H*> <HR> <ISINDEX> <MENU> <OL> <P> <PRE> <UL>
Whenever you use a quote more than 1 line long from an external source, it's a good idea to use <BLOCKQUOTE>. Don't forget to attribute your sources, either (remember to use <CITE> to highlight the actual publication, if applicable).
<BLOCKQUOTE>
This is what happens when I roll my head around on the keyboard:
a;sdlkg jvkj ads;oivus d/klsjf;askldfhkgjhds;fg;liunb ;zdr7i
</BLOCKQUOTE>
(Anonymous, from This is Your Brain on the Internet by Michael Chechik Sunday)