What does saving a "poorly formed" epub do?
I was working on an epub. Making a lot of changes. Doing the 'mend and prettify' option and saving a lot. Everything going along nicely. Then when I went to save one time I got a warning window saying the epub was not properly formatted (or something like that, maybe 'properly formed') and it said somethig about fixing it etc. and that I might lose some data. I Xed out of the window, thinking that would give me time to see what the problem was, but when I did, the bottom of the screen said something like 'epub saved but you may have lost a small amount of data.'
Questions:
1) Why did it save it when I just Xed out of the window?
2) What should I have chosen to not save it if I get that window again?
3) If I get that window again and get out of it without saving it, will checking the Tools>'Well-formed check epub' tool tell me what's wrong?
4) (and i realize this is unanswerable in a concrete way) What are the chances I lost a lot of data?
5) What is the typical data loss in that situation?
Thanks.
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