Quote:
Originally Posted by Sabardeyn
Padding seems to have been the situation. In a ~150 page book there were at least 150+ instances of   usage that I recall. It might have been as high as 200; re-importing into Sigil afterword showed no errors that I could see in the text / layout.
While I did not think their were any repercussions, I did want to take the opportunity to double check. Just in case.
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Ok, that was posted a long time ago already but I just wanted to say that there are legitimate usages for non-breaking spaces : mainly you want to use them between two words/symbols that must be separated by a space but never by a newline. Good usage includes thing like "yada :" or before a !, ? or ..., they also should be used between the first and last name of an author or things like that. Of course visually there's no difference in most case but since you're outputting a reflowable format, you may get wrong results on some displays if you don't use them.
To be honest I'm not sure they're used much, even in professional epub (though given the quality of many of those that may not be a criteria) but as a result you get some really misplaced newlines from time to time, so using them is one of those invisible little thing that improve the comfort of your reader (and of which he'll never ever be aware, life as a typesetter sucks).
(of course I'm not advocating their use for padding, you should normally try to avoid such abuse since it's unlikely to degrade as nicely as a CSS directive)
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Jedaļ