HTMLParser close() issue

[aeh]

BPO	42764
Files	htmlparse_bug.py: Self-contained Python module containing a demo of the bug, plus test infrastructure

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2020-12-30.09:25:07.268>
created_at = <Date 2020-12-28.14:49:01.418>
labels = ['invalid', 'library', '3.9']
title = 'HTMLParser close() issue'
updated_at = <Date 2020-12-30.09:25:07.267>
user = 'https://bugs.python.org/aeh'

bugs.python.org fields:

activity = <Date 2020-12-30.09:25:07.267>
actor = 'aeh'
assignee = 'none'
closed = True
closed_date = <Date 2020-12-30.09:25:07.268>
closer = 'aeh'
components = ['Library (Lib)']
creation = <Date 2020-12-28.14:49:01.418>
creator = 'aeh'
dependencies = []
files = ['49702']
hgrepos = []
issue_num = 42764
keywords = []
message_count = 2.0
messages = ['383896', '384052']
nosy_count = 1.0
nosy_names = ['aeh']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue42764'
versions = ['Python 3.9']

[aeh]

HTMLParser close() does not seem to dispose of previous HTML analyses.

I an sending a simple test to demonstrate this, complete with functions
that are part of a set of testing facilities. The problem is present for more complex HTML.

[aeh]

Resolved by correct initiation of subclass