[issue20623] Run test_htmlparser with unbuffered source

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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type: behavior -> enhancement
versions: +Python 3.8 -Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue20623>
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