Webmasters: Is the value href in the base tag for reference only or points to a URL that must exist?

Is the value href in the base tag for reference only or points to a URL that must exist?
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(webmasters.stackexchange.com/users/137578/mike-s)mike_s
(webmasters.stackexchange.com/users/43176/richardb)RichardB
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html tags links url