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Here are some hints about testing modifications to macro packages and
manual pages.
1. Use groff's '-ww' option to catch potential problems.
Ideally, there shouldn't be any warnings.
2. For a well-formedness check, run doclifter (http://catb.org/~esr/doclifter)
against your page. This tool was written to lift pages to XML, but as a
side effect it acts as a validator that will warn you of potential problems
and non-portable constructs.
3. The two most important groff client types are X terminal emulators
and Postscript printers. Eyeball-check your output under both.
4. The colorized man output of the Midnight Commander (what you get by
pressing the F3 key on a man page) is good for making small errors
more visible.
5. Try different terminal line lengths, say, 80 and 100 characters.
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