base tag

In an earlier exchange today Steve Mount gave this (partial) reply to a question about directory structure and finding files in a
site directory:

>>Alternately, you can use add "base" tag in each page's head, though it may
cause other problems, as all relative URLs will use the new base:<<

My question is: what "other problems"?

Thanks!

Mike Hopkins
ironmike(at)inav.net

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