One good reason is that the contrast between black text and dark blue links isn't very good, so the underlines are quite useful if your color perception isn't all that good.

I have young and sufficiently good eyes, so I remove the underscores with custom CSS.

In reply to Re: CSS in Perlmmonks.com by moritz
in thread CSS in Perlmmonks.com by thenetfreaker

Title:
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