<BASE> Base URL

Description
When used within a document, all anchors and hypertext links in the document will have a base URL equal to that of HREF. This means that relative URLs can be used for the hypertext links instead of absolute ones. The TARGET attribute is used to denote the default target frame for the hypertext links.

For example, supposing the following base is used:
<base href="http://www.website.com/index.html" target="defaultframe">

To reference a document "http://www.website.com/doc1.html" you only have to type:
<a href="doc1.html">A link to doc1.html</a>

Syntax
<BASE [HREF=base URL] [TARGET=target frame]>