Bug report

Bug description:

WhenHTMLParser is initialized withconvert_charrefs=False, it behaves incorrectly when processing an invalid named entity reference (e.g.,&A, which is not a valid HTML entity). The parser silently drops the& character and only passes the subsequentA tohandle_data. I think this indicates a silent data loss problem.

fromhtml.parserimportHTMLParserclassMyParser(HTMLParser):defhandle_data(self,data):print(f"handle_data received:{data!r}")parser_false=MyParser(convert_charrefs=False)parser_false.feed('&A')parser_false.close()

handle_datareceived:'A'

CPython versions tested on:

3.12

Operating systems tested on:

Linux

Linked PRs

• gh-140875: Fix handling of unclosed charrefs before EOF in HTMLParser #140904
• [3.14] gh-140875: Fix handling of unclosed charrefs before EOF in HTMLParser (GH-140904) #141745
• [3.13] gh-140875: Fix handling of unclosed charrefs before EOF in HTMLParser (GH-140904) #141746