Google has now implemented offline functionality to another service in their web-based productivity suite, Google Drive. The latest to get this invaluable feature is Google Slides. Now users can create, edit, and present without an Internet connection. Any changes to the presentation will automatically be saved once an Internet connection is detected.
To utilize this new feature, all you have to do is turn the "offline editing" feature on through Google Drive. Users who already have offline editing for Docs enabled, won't need to change any settings to get this new feature. However, take note that offline editing can only be used on Chrome browsers or on machines running Chrome OS. According to the Google Drive Blog, Google Sheets will be the next service to get offline functionality.
Source: Google Drive Blog