I'm using notugly.xsl on a dot source file you can find at
https://github.com/dankamongmen/openscad-models/blob/master/schwarz.dot
everything was working alright until I started using some HTML labels. At that point, the content of the HTML labels is blanked in notugly.xsl output.
before:

after:

I'm using notugly.xsl on a dot source file you can find at
https://github.com/dankamongmen/openscad-models/blob/master/schwarz.dot
everything was working alright until I started using some HTML labels. At that point, the content of the HTML labels is blanked in
notugly.xsloutput.before:
after: