<p><span class="issue-keyword tooltipped tooltipped-se" aria-label="This pull request closes issue #2823.">Fixes</span> <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="697624749" data-permission-text="Title is private" data-url="https://github.com/openstreetmap/openstreetmap-website/issues/2823" data-hovercard-type="issue" data-hovercard-url="/openstreetmap/openstreetmap-website/issues/2823/hovercard" href="https://github.com/openstreetmap/openstreetmap-website/issues/2823">#2823</a></p>
<p>The panels are collapsed by default, when there is a long list of features, but open on short lists to save on clicks. 10 items is arbitrary but seemed reasonable.</p>
<p><a target="_blank" rel="noopener noreferrer" href="https://user-images.githubusercontent.com/360803/93344084-9085df80-f831-11ea-979b-42d66143c8dd.png"><img src="https://user-images.githubusercontent.com/360803/93344084-9085df80-f831-11ea-979b-42d66143c8dd.png" alt="Screenshot from 2020-09-16 15-29-19" style="max-width:100%;"></a></p>
<p>This is one of those "how hard can it be", "oh wait that took longer than expected" kinds of thing. Thanks to <a class="user-mention" data-hovercard-type="user" data-hovercard-url="/users/tordans/hovercard" data-octo-click="hovercard-link-click" data-octo-dimensions="link_type:self" href="https://github.com/tordans">@tordans</a> for the pure-html suggestion, I think it looks reasonable. But I think a proper designer could do better. I'm not 100% happy with the duplication between the <code><h4></code> section titles and the <code><summary></code> labels, but putting titles in the summaries breaks the layout and I think this PR is at least a little better than the previous situation. Similarly, I went back and forth on whether small lists should be handled differently, whether small lists should even have the summaries, and trying to balance consistent behaviour vs excess clicking etc.</p>
<p>Feedback welcome, and I'm happy to change things in future too.</p>

<hr>

<h4>You can view, comment on, or merge this pull request online at:</h4>
<p>  <a href='https://github.com/openstreetmap/openstreetmap-website/pull/2837'>https://github.com/openstreetmap/openstreetmap-website/pull/2837</a></p>

<h4>Commit Summary</h4>
<ul>
  <li>Show linked features as collapsable detail panels on feature browse pages</li>
</ul>

<h4>File Changes</h4>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2837/files#diff-cadb03614fd69c72a82a99f6af6c3c22">app/views/browse/_node.html.erb</a>
    (24)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2837/files#diff-f2fb4b9ca7f6bb961fc6c28d8f964a52">app/views/browse/_relation.html.erb</a>
    (14)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2837/files#diff-680c699c09c527162aa641c79b872fce">app/views/browse/_way.html.erb</a>
    (34)
  </li>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2837/files#diff-37c9b835927e3c363588f172de9bb6fa">config/locales/en.yml</a>
    (11)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/2837.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/2837.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/2837.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/2837.diff</a></li>
</ul>

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