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

[Andy Allan]

gravitystorm left a comment (openstreetmap/openstreetmap-website#6448)

I like the idea overall! Some small notes

> Red/green colorblindness is definitely a thing, so what I have is suboptimal from that standpoint.

Yeah, we will need some non-colour indications here

> What about using the arrow to show something like "not present → " and " → not present", with "not present" in italics? It looks quite a bit visually noisier though:

It's worth noting that not all languages have italics (e.g. Chinese) so we can't rely on italics to differentiate between user-generated tag values and system-generated UI text.

And I like the variations with the strong border and more gentle backgrounds. I wouldn't be surprised if the strong red background is too close to the blue link colour to pass the accessibility contrast checks, but I haven't actually checked the numbers on this.

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