Easy-to-parse output in CGI mode

[nealmcb]

When run in CGI mode, the output seems to only be available as HTML. But if I want to process the output, HTML can be a hassle to parse.

So I'd like an option for CGI mode to output a csv file or json which would be easy to parse. Or the default output format might be OK, but I don't know what it looks like.

This would make the w3c service more useful, not requiring users to download and install the tool to get non-HTML output.

Providing an example in the documentation of the non-HTML output would also helpful.