Microsoft Word now flags double spaces after a period as errors
Interesting thing is, living in Europe, AFAIR I never heard about "use two spaces" rule until now (even if in a long monospace plaintext, I might have subconsciously used it sometimes to disambiguate).If I saw that in a Word document, however, I would have thought the author was a technically-illiterate person who puts extra spaces around commas, quotes, parentheses etc. or uses 10 spaces instead of 1 tab for indentation.---Talking typography trivia:  in French language, it's mandatory to put a space before "double-characters" like : ; ? ! - the side effect is that it often allows to easily recognize a French person online even if they write in English.Most people: Hello! How are you?French people : Hello ! How are you ?