Internal Program Version: html5lib  1.1

HTML parser designed to follow the HTML5
specification. The parser is designed to handle all flavours of HTML and
parses invalid documents using well-defined error handling rules compatible
with the behaviour of major desktop web browsers.

Output is to a tree structure; the current release supports output to
DOM, ElementTree, lxml and BeautifulSoup tree formats as well as a
simple custom format

https://github.com/html5lib/html5lib-python