Dynamicdeezign, documentation of html and css
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<base> : document base URI
This attribute specifies an absolute URI that acts as the base URI for resolving relative URIs
It's defined in header html document <head></head>
-) href = url in use
Example :
<base href="http://your_page.html">
-) target
<base target="_blank">

For complete reference see html reference at W3C
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