[openstreetmap-website] Changeset history - there's no indication to a user which changesets have already been viewed (#604)

[Midgard]

This would be extremely easy to implement and actually improve moderation of changesets IMO, especially of a contributor that has a lot of changesets without a comment, e.g. http://osm.org/user/LorenzoMe/history.

```css
#sidebar .changesets h4 a:visited {
    color: #4b2f89;
}
```

![How different colours would look](https://cloud.githubusercontent.com/assets/4283376/8830093/b16d2fb4-309a-11e5-9f87-d3da8fd73656.png)

It may however not align with your idea of how the links should appear.

You could also add a check mark or little eye or so, but then you would probably have to keep the user's viewing history in localStorage or on the server because you can only style the color of visited links (as a safety measure to prevent websites from [scraping your browser's history](http://sixrevisions.com/css/visited-pseudo-class-strange/)).

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/604#issuecomment-123775952
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