[openstreetmap/openstreetmap-website] Show tag changes in object history view (PR #6448)

[Minh Nguyễn]

1ec5 left a comment (openstreetmap/openstreetmap-website#6448)

This is a smart design, makes it a lot easier to find changes at a glance. My first impression is that we could probably even diff within a changed tag, word by word like MediaWiki does, for more clarity. But we can always fine-tune the presentation separately.

> I wonder if there's a way to make this work with assistive technologies too. An aria-* tag or something, but I can't find anything right now and it's a very tricky subject anyway. Perhaps for a future PR.

Along these lines, we should probably supplement the colors with some other visual distinction, because the traffic light colors aren’t great for colorblind friendliness. We already use these colors in the change counts in a changeset listing, but the user can depend on the position to distinguish between additions and deletions. Here the user can depend on deletions to be italicized and changes to have a “→”. But nothing distinguishes an added tag from an unchanged value. Not sure if that’s a problem with these particular colors. We should track colorblind friendliness in a separate issue if it isn’t trivial to deal with in this PR.

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