The Xmp element displays characters "As-Is" in the browser
using a fixed-width font. Recommended display of this element is an 80
character line length. Until a closing Xmp tag is encountered, other HTML
tags are displayed as text and not evaluated.
The rules for this sort of behavior can have many consequences in parsing
techniques, thus the use of this element is strongly discouraged (the PRE
element should be used instead.) This element, along with the LISTING and
PLAINTEXT are no longer standard HTML. They are considered
"obsolete" in the HTML 2.0 and 3.2 specifications and are not
included at all in HTML 4.0. These elements should be
implemented by browsers for backward compatibility with pages already
using the elements.
DTD Note: This element is listed as an "Obsolete
Element" in the HTML 2.0 DTD but is still listed under "Deprecated
Elements" in the expired HTML 3.0 draft HTML 3.2 recommendation.
It is still understood by some browsers.
Because this tag has limited or no support in the HTML
specifications, neither support or appearance in different browsers
can be guaranteed.
Browser Peculiarities
Netscape and Mosaic are the only browsers to display all
characters literally.