HTML-Header Elements
Base Element and Link Element
The BASE Element The BASE element is used to specify the full original URL of the document. This allows relative links to work, even if a document has been moved to another directory (or even to another machine!).
In this way, a BASE element allows the viewing software to find a document link, even when directed from a parent in a different location. The BASE element has a single required attribute which provides the full URL of the document: HREF
The LINK Element If the BASE element allows a browser to locate a document, there still exists the question of what the relationship between two documents might be. This becomes even more important as the complexity of your HTML document increases. To connect documents together logically, HTML includes the LINK element. The LINK element indicates the relationship between the document that contains the tag and another document (or other object). It consists of an URL that points to the reference object and an attribute that serves as a description of the relationship. In other words, if a parent HTML document provided a link to the current child HTML document, the current document could provide a tag back to the parent to indicate that relationship. A document can contain as many LINK elements as needed to describe all of the relationships
