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I'll agree that adding alt text is meaningful. Not all images need alt, and the existence of alt text differentiates between decorative images and informative images. When images or figures are used in outputs we can assume they are informative and a lack of alt text is a impending violation.
With that said, coming up with a meaningful default message is completely ill defined. So yes we should have alt text, but what that should be is hard to imagine. alt should describe the image itself and we need to avoid misusing alt text. We can't make assumptions about the compute context or infer the meaning of the figure. The best we can say is "there is an informative image here, it is not decorative". Ultimately, we are delivering bad news to visually impaired users that they can't participate in all of the information, but at least the existence of the figure is announced because it is not decorative anymore.
another practical implementation would be some guard rails that produce errors (strict more) or warnings that they are producing inaccessible images or content.
Consider a cell with
The default rendering of the output is
Should we have an default
alt
text?Related issues and pull request: #1112
cc @Jenneh @isabela-pf
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