doc/bugs/htmlbalance_fails_with_HTML-Tree_v4.mdwn



[[!template id=gitbranch branch=smcv/ready/htmlbalance author="[[smcv]]"]]
My one-patch htmlbalance branch fixes incompatibility with HTML::Tree 4.0.
From the git commit:
The HTML::Tree changelog says:

    [THINGS THAT MAY BREAK YOUR CODE OR TESTS]
    ...
    * Attribute names are now validated in as_XML and invalid names will
      cause an error.

and indeed the regression tests do get an error.