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<BASE TARGET="">, used in frame creation for HTML documents. If there is currently highlighted text in the active edit window, the <BASE TARGET=""> will replace it. Some of the valid values inside the quotes are another named frame, or one of the following choices:
_self
It is sometimes convenient to use the built in _self target value rather than a
frame name if the hyperlink updates the current frame. In other words,
the referenced document is loaded on top of the document presently in
the window/frame.
_top
To get rid of all the frames on a page use the _top target value.
What this target actually does is search though all the parent documents
until it finds the place where the frames started. Often this is a
document that "takes up" the entire screen.
_parent
This target refers to the document from which the present document
was spawned. So if you referenced b.html from a.html and you click on a
hyperlink in b.html that has _parent as the target, then the new
hyperlink will load in the window where a.html is. In other words, the
newly referenced hyperlink will replace a.html.
_blank
This target will load the referenced html document into a new,
unnamed window.