Although there is not an officially-supported fully-offline mode, Figma does spend a significant amount of effort preserving changes made offline if the server disconnects and the tab is closed or crashes. Additionally, pushing out a newer version of the file format from N to N+1 requires a delicate dance between client and server to reload the file, upgrade the stashed changes, and merge. These and many other edge cases are handled as invisibly as possible to the user. A really fun edge case is if user A spends an entire weekend offline working furiously populating some page of a document, user B wonders why there's a seemingly empty page in the document and deletes it, user A comes back online and tries to apply changes to a parent node that no longer exists....Disclosure: I used to work on some of this when I was at Figma.
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