Attribute for <BASE ...>
TARGET ="_blank" |"_parent" |"_self" |"_top" |frame name

TARGET sets the default target for hyperlinks on the page. TARGET uses the same values as <A TARGET="...">. Consider a framed page in which the lower frame is named "CONTENT" and the upper frame uses this tag:

<BASe TARGET="CONTENT">

All the links on the page will, without using any TARGET attribute of their own, target the lower frame.

this code	produces this
<BASe TARGET="CONTENT">	this page

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