+	2.0	3.0	3.2	4.0
1.0	2.0	3.0	4.0
1.0	2.0	3.0	4.0
1.0	2.0
1.0	2.1	3.0
0.9	1.2

<base>

empty
start tag	required
end tag	forbidden

Sandia Reference

This establishes a "default" URL for the site. It is placed into the browser's memory and all links that do not specify a complete path are computed relative to the "default" established by the <base> tag. If you chose not to use the <base> tag, my experience has been that this is the normal way that the browser acts anyway. Experimentation in order.

Example
<base href="http://www.htmlcompendium.org/index.htm"> This is the base element for this site.

class=

1.0

2.0

3.0

4.0

href=

+	2.0	3.0	3.2	4.0
1.0	2.0	3.0	4.0
1.0	2.1	3.0
0.9	1.2

specifies the default URL of the document

id=

1.0

2.0

3.0

4.0

Warning: there are two possible meanings of this particular use of "id=". There is the normal use of "id=" and follow the link on the attribute name for more information on that use.

The second meaning is used exclusively by WebTV. It is the same as the "name=" attribute below so the explanation is shared. Their description is as follows:

"The name attribute can be used with client functions. However, client functions are not recommended for content developers. These functions are intended for use by WebTV Networks for developing basic WebTV functionality."

lang=

1.0

2.0

3.0

4.0

list of language codes
list of country codes

target=

+	2.0	3.0	3.2	4.0
1.0	2.0	3.0	4.0
1.0	2.0	3.0	4.0
1.0	2.0
1.0	2.1	3.0
0.9	1.2

for use in frames, specifies the target window (Netscape)

"_blank" makes the link to load into a new blank window. This window is not named. (Netscape)

"_parent" "This target makes the link load in the immediate FRAMESET parent of this document. This defaults to acting like "_self" if the document has no parent." (Netscape)

"_self" "This target causes the link to always load in the same window the anchor was clicked in. This is useful for overriding a globally assigned BASE target." (Netscape)

"_top" "This target makes the link load in the full body of the window. this defaults to acting like "_self" if the document is already at the top. It is useful for breaking out of an arbitrarily deep FRAME nesting." (Netscape)