<p>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. <a href="http://osm.org/user/LorenzoMe/history">http://osm.org/user/LorenzoMe/history</a>.</p>

<div class="highlight highlight-css"><pre><span class="pl-e">#sidebar</span> <span class="pl-e">.changesets</span> <span class="pl-ent">h4</span> <span class="pl-ent">a</span><span class="pl-e">:visited</span> {
    <span class="pl-c1"><span class="pl-c1">color</span></span>: <span class="pl-c1">#4b2f89</span>;
}</pre></div>

<p><a href="https://cloud.githubusercontent.com/assets/4283376/8830093/b16d2fb4-309a-11e5-9f87-d3da8fd73656.png" target="_blank"><img src="https://cloud.githubusercontent.com/assets/4283376/8830093/b16d2fb4-309a-11e5-9f87-d3da8fd73656.png" alt="How different colours would look" style="max-width:100%;"></a></p>

<p>It may however not align with your idea of how the links should appear.</p>

<p>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 <a href="http://sixrevisions.com/css/visited-pseudo-class-strange/">scraping your browser's history</a>).</p>

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