I 'm not sure how possible it is (there's bound to be a way), but it's definitely not easy.
When you look at a word document inside the web browser, technically you aren't really looking at the online document (Word can't do that). What happens is that a temporary copy of the document is created on your computer and then opened in Word. So when you save, you 're just saving changes to a file that's only present in your system's "temporary files" folder.
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