How to automatically validate html?

Question

Python

There was a need to validate many html files. Arrange indents (or at least not delete existing ones), close unclosed tags, and so on.
Of the online services, I did not find those that close the tags, only indent them.
From the Tidy programs, but she is weird and does something completely different. text turns into text
I tried to use html5lib for python, but nothing good came of it either.

import html5lib

def pars(html):
    parser = html5lib.HTMLParser(tree=html5lib.getTreeBuilder("dom"))
    dom_tree = parser.parseFragment(html)
    walker = html5lib.getTreeWalker("dom")
    stream = walker(dom_tree)

    s = html5lib.serializer.htmlserializer.HTMLSerializer(omit_optional_tags=False)
    return u''.join(s.serialize(stream))

res = pars(u'html code')
print res

Are there ready-made solutions for such validation, at least to close unclosed tags?
PS It seems that chrome itself can close unclosed tags, but can other browsers, like chrome, slightly tweak html, closing unclosed tags, etc.? (firefox, opera, ie)
Thanks for the replies.

Answer 1

Use Jade

Answer 2

lxml.de/parsing.html#parsing-html+stackoverflow.com/a/9050454
_
_
lxml.etree.HTMLParser()? - (because the xml is broken) Here's a secret - HTMLParser() is... a Parser with recover=True