I personally have no idea about typography, but I use double space after a period for semantics --- as a sentence terminator. because, you know, there are languages where periods are used not only for terminating sentences.
as a side note --- capitalising the first letter of a sentence is a convention similar to putting two spaces between sentences. why does the author do this?
as a side note --- capitalising the first letter of a sentence is a convention similar to putting two spaces between sentences. why does the author do this?