Word for web includes a limited set of Track Changes features. As this article said, if you have the Word desktop application, use the Open in Word command to open the document and turn on track changes. When you’re done and you save the document, it will continue to be stored where you opened it in Word for the web. Tracked changes will be preserved and—if you turned on Track Changes before you opened the document in Word for the web—any changes you make in Word for the web will also be tracked.
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