difflib.HtmlDiff produces different output from difflib.ndiff #71896

assignee = None
closed_at = None
created_at = <Date 2016-08-08.15:40:57.110>
labels = ['type-bug', 'library']
title = 'difflib.HtmlDiff produces different output from difflib.ndiff'
updated_at = <Date 2018-09-22.18:00:18.520>
user = 'https://bugs.python.org/SilentGhost'

activity = <Date 2018-09-22.18:00:18.520>
actor = 'xtreak'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2016-08-08.15:40:57.110>
creator = 'SilentGhost'
dependencies = []
files = []
hgrepos = []
issue_num = 27709
keywords = ['patch']
message_count = 2.0
messages = ['272173', '272196']
nosy_count = 6.0
nosy_names = ['loewis', 'terry.reedy', 'eli.bendersky', 'SilentGhost', 'jlwing', 'xtreak']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'needs patch'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue27709'
versions = ['Python 3.5', 'Python 3.6']