I've submitted a proposal to WHATWG about a provenance/origin classifier for alt text on images.
https://github.com/whatwg/html/issues/11448
The current HTML specification provides the alt attribute on images to supply alternative text for users who cannot see visual content. However, there is no way to indicate whether the alt text was authored by a human or generated automatically by a machine (e.g., via AI or computer vision).

Proposal: New attribute alt-origin to indicate provenance of alt text (machine vs. human authored) · Issue #11448 · whatwg/html
What problem are you trying to solve? The current HTML specification provides the alt attribute on images to supply alternative text for users who cannot see visual content. However, there is no wa...