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

[Waldir Pimenta]

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

> ~Strikethrough~ is the default user agent styling for `<del>` tags. The corresponding `<ins>` tag gets underlined. Unfortunately, underlining gets confusing when text can be linked, and especially with `camel_case` keywords. We aren’t using **bold** for anything yet, and it would make it easier to see at a glance when something has been introduced in the element history.

Apologies for the late comment but I don't see additional discussion about this. I am confused about the `<del>`/`<ins>` approach having been abandoned, since the removed parts are pretty evident with the strikethrough formatting, and as for the new parts, CSS could be used to omit the underlining, since the absence of strikethrough should be enough to distinguish the old vs. new values.

I'm especially puzzled that this additional marking of the values (besides the coloring), which is being considered due to accessibility concerns, has moved away from the semantic HTML tags that would make the result universally unambiguous not just for those with color vision limitations, but also for the blind users relying on screen readers. (And it would even be machine-readable!)

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