The Image-Suggestions feature allows users to match a suggested image with an article. The feature is designed to engage newcomers.
While the feature requires that users add a caption for the image, we do not provide the ability to add alternative text for the image.
From an accessibility standpoint, this is problematic because are encouraging edits that exclude sight-impaired users from the additional knowledge and context that the image suggestion edits are meant to provide.
It's possible that many of the captions that users write could function perfectly well as alternative text. In that case, we could provide UX element to allow users to indicate that the caption can be used as alternative text, simplifying the overall amount of effort for image suggestion edits. Note that on enwiki, the convention according to WP:ALT is to use "alt=refer to caption" for this scenario.
Proposed design
Note the proposed initial design below is for the proposal to enable entry of an additional alt text field as *optional* as part of the "Add image" structured task (in the caption step). Another avenue to address this issue may be for another structured task entirely for adding ALT text to any image missing this field.
| Add alt text as a frameless icon button under the caption inout field | Dialog to add the alt text when the button is selected |

