I checked it again, one can download the source code of their service
from here http://validator.w3.org/source/
and it is even packaged in some of the linux distros.

(It is of course slightly outdated on Debian)

Someone might want to write a wrapper around it
or maybe use WebService::Validator::HTML::W3C with a
local URL instead of the real W3C service.

Gabor

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