The Blockquote element usually indicates content quoted from
another source. This block element should be used ideally only when the quotation
is longer and will likely span several lines (for shorter, in-line quotations the
new Q element is suggested.) It is usually rendered with a
left indent and possibly an equal right indent as well.
Many authors use this element to indent text, because the indenting
is standard behavior on most all browsers. In theory, one should not
use this element for this purpose (it should only be used in situations where
you wish to quote a source), but if you REALLY need bulk indenting,
this element works well in most cases (see the page on
indenting for more ideas of how
to indent in HTML.)