10 Reasons to Love Google Docs - SitePoint
Briefly

But Google Docs doesn't miss a beat when the Wi-Fi shuts off. It transitions smoothly from online to offline mode and still allows you to create new documents and work on existing ones. The moment you reconnect to the internet, all changes will be synchronized.
Google Docs provides instant access to definitions, synonyms, and occasionally antonyms of any selected word using its Define tool. You'll see a sidebar pop up with the same information as you would find on the Google search but without any hassle.
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