Copied from my post at: https://www.mediawiki.org/wiki/Help_talk:Extension:Kartographer#Not_.27alt.27
I'm very concerned at the suggestion:
Use alt for the link hint text.
This is likely to cause confusion with the "alt" attribute on images, which is for a text alternative to an image, for people who cannot see the image (blind people, people using text-only or audio interfaces, etc). In the example given here, the appropriate alt attribute might be something like "the Exploratorium is on 21st and 8th street".
It's hard enough as it is to get people to use appropriate alt attributes on images; encouraging them to think in terms of "hint text" will not help. Could the attribute in this case please be renamed?