I am in progress of doing just that for a cloud gaming platform of mine: https://borg.games
If you want to save your game progress, you just login with OneDrive.
I previously made a single-page EPUB reader using a similar technique with GDrive: https://h5reader.azurewebsites.net/ (that one does not work with 3rd party cookies disabled though because it uses iframe to login instead of redirects, and I never bothered to update it).
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I am in progress of doing just that for a cloud gaming platform of mine: https://borg.games
If you want to save your game progress, you just login with OneDrive.
I previously made a single-page EPUB reader using a similar technique with GDrive: https://h5reader.azurewebsites.net/ (that one does not work with 3rd party cookies disabled though because it uses iframe to login instead of redirects, and I never bothered to update it).