Ooops! I realized that my client is saving the CMS files without the "HTML filter" option, and have to give her a call. I uploaded the home page again, checked the "view page code" and it is now relatively "clean." It looks like this "save as" option is only available on MS Word 2010+

Thank you for the LibreOffice idea. The simpler, the better, especially for the client; and the price is right! FYI, I tried a couple of online doc providers, like Google Docs, and was not able to duplicate this experiment. That would be close to the ultimate all-online solution...