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With all that being said, let's go over what #AltText is not.
It isn't meant to provide information that someone wouldn't be able to gleme on their own by looking at it, unless there are previous instances in which this information has been presented.
For example:
An image of Fluffy, a cat with orange fur, sitting in a black armchair. He's looking away from the camera, towards a potted minirose in the corner of the room he knocked over a few minutes earlier.