I'm not 100% sure, since this module is a parser and not a serializer,
but it appears HTML::HTML5::Parser is just building a DOM, and the
serialization is then done by XML::LibXML. Therefore, it seems likely
the bug is indeed in HTML::HTML5::Parser.
The upstream bug tracker is at
https://rt.cpan.o
I was able to reproduce the bug, and I have committed the example as test data
to my own fork of the module:
https://github.com/kjetilk/p5-html-html5-parser/commit/c4be3e6ee63d0850079c115ef4274e4c2c3befa9
I'm not a maintainer, so it doesn't bring us much closer to a solution though.
Just did it
