[[Wikipedia:Alternative text for images]] says that "alt" attributes of images should be used to emphasize the their most important visual aspects. Since there's no syntax to change image contents (eg. crop) in rendering, the same image on every page looks the same, but we have to repeat the description of how it looks on every page.

I suggest a {{DEFAULTALT:}} tag in image description pages. The content in it will be used for the image as its "alt" attribute on every page, and can be overridden by ...|alt=|... syntax.

Version: unspecified
Severity: enhancement