When typing, do you put one, or two spaces after your full stops? I put one, but it seems like a lot of people put two.
I’m not sure why this is, other than a hangover from manual typewriters when it looked better.
Or perhaps it’s like the thing where Catholics pronounce H as “haitch”, and everybody else “aitch”?
In web pages it makes no difference; in HTML only one space will be displayed. Where it really matters is where your final output will be on paper (virtual/PDF, or real), the extra spaces have an impact.
Maybe it’s like asking which way you put your boiled egg in the cup. The sort of thing Lilliput might go to war over, but ultimately it’s not all that important.
Doesn’t stop me stamping them out when they creep into text I’m in charge of though. Death to double spaces!