There are two additional header tags that have the primary functions of supporting document automation and interacting with the web server itself and document-generation tools.
Given the rich set of header tags for
defining a document and its relationship with others that go unused
by most authors, you’d think we’d
all be satisfied. But no, there’s always someone
with special needs. These authors want to be able to give even more
information about their precious documents — information that
might be used by browsers, readers of the source, or
document-indexing tools. The
<meta> tag is
for those of you who need to go beyond the beyond.
<meta> tag belongs in the document
header and has no content. Instead, attributes of the tag define
name/value pairs that associate the document. In certain cases, these
values are used by the web server serving the document to further
define the document content type to the browser.
attribute supplies the name of the name/value pair defined by the
<meta> tag. Neither the HTML nor the XHTML
standard specifies any predefined
<meta> names. In general, ...