The Listing element displays all characters "As-Is" in the
browser as a fixed-width font. Recommended display of this element is a 132
character line length. Until a closing LISTING tag is encountered, other
HTML elements are displayed on screen 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 is no longer standard HTML.
It is considered "obsolete" in the HTML 2.0 , 3.0 and 3.2
specifications, and is not mentioned in HTML 4.0. It may be implemented
by browsers for backward compatibility.
DTD Note: This element was 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 and HTML 3.2 recommendation.
It is still understood by some browsers as well.
Because this element has limited or no support in the HTML
specifications, neither support or appearance in different browsers
can be guaranteed.
Browser Peculiarities
Netscape is the only browser that complies with the 132 character
line length.
Mosaic is the only browser to display all characters literally.