<BASE>

Supply the full address of the document. This can be used to let a user, who reads the document out of context, know the address of the original document. This tag must be specified inside the HEAD section of the document.
The value of the BASE tag is used for dereferencing relative URLs, using the rules given by the URL specification, e.g. :
<BASE href=http://www.acme.com/intro.html> ... <IMG SRC=icons/logo.gif>
The image is dereferenced to :
http://www.acme.com/icons/logo.gif
In the absence of a BASE element the document URL should be used.
Note that this is not necessarily the same as the URL used to request the document, as the base URL may be overridden by an HTTP header accompanying the document.

HREF
This attributes specifies the location of the document as an absolute or relative URL. The absolute URL is used without modification. If a relative URL is specified, all subsequent URL's in this document are relative to this URL. This means links to images, other documents etc. will use this BASE address.

TARGET
This is used when you want all (or most) of the links in a document to be targeted to the same window. In this case the TARGET attribute establishes a default window_name that all links in this document will be targeted to.
This default can be overridden by using the TARGET attribute in a link.


HREF	This attributes specifies the location of the document as an absolute or relative URL. The absolute URL is used without modification. If a relative URL is specified, all subsequent URL's in this document are relative to this URL. This means links to images, other documents etc. will use this BASE address.

TARGET	This is used when you want all (or most) of the links in a document to be targeted to the same window. In this case the TARGET attribute establishes a default window_name that all links in this document will be targeted to. This default can be overridden by using the TARGET attribute in a link.