Most XHTML 1.0 elements permitted within the body are classified as
either block-level elements or inline
elements. Inline elements typically may only contain text and
other inline elements. When rendered visually, inline elements do
not usually begin on a new line.
The following are defined as inline elements in
XHTML 1.0:
The following elements may be used as either block-level elements or inline elements. If used
as inline elements (e.g., within another inline element or a
p), these
elements should not contain any block-level elements.