Newer methods allow you to do a lot more - report progress of the upload, even read the file locally before upload (so you can resize images, for example). They

Newer methods allow you to do a lot more - report progress of the upload, even read the file locally before upload (so you can resize images, for example). They're all great features to add, and I guess that GitHub decided that it was worth adding them and not keeping an older experience for Safari users. IMO, they're both at fault here. GitHub should be able to provide a fallback, but also Safari should be keeping up to date.