<hypertext> (Or "span", "region", "button", "extent") An area
within the content of a hypertext node (e.g. a web page)
which is the source or destination of a link. A source
anchor may be a word, phrase, image, or possibly the whole
node. A destination anchor may be a whole node or some
position within the node.
Typically, clicking with the mouse on a source anchor causes
the link to be followed and the anchor at the opposite end of
the link to be displayed. Anchors are highlighted in some way
(either always, or when the mouse is over them), or they may
be marked by a special symbol.
In HTML anchors are created with the <A..>..</A> construct.
The opening A tag of a source anchor has an HREF (hypertext
reference) attribute giving the destination in the form of a
URL - usually a whole node or "page". E.g.
<A HREF="http://foldoc.org/">
Free On-line Dictionary of Computing</A>
Destination anchors are only used in HTML to name a position
within a page using a NAME attribute. E.g.
<A NAME="chapter3">
The name or "fragment identifier" is appended to the URL of
the page with a "#":
