For the past years many of the browsers improved the conversion from Word to HTML. In the past a lot of junk HTML like <o:p>, mso tags and attributes came from the clipboard when pasting from MS Word, but now the things change for good and we can expect even better support for Word in the future.
Presently, there isn't a 100% nicely working paste from Word, but usually the Microsoft browsers play a bit better with Word since it is a Microsoft product. This does not mean that everything will come 1:1 from Word but you can test.
It depends on the content of the Word file too. If they are created in Word they might be converted better, but if they are pasted from another program in Word, the contents might be malformed and mangled and this can cause troubles too.
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