<p dir="auto">Presumably this was an oversight in the original implementation: <code class="notranslate">OSM.params</code> falls back to the page's <code class="notranslate">query</code> string if the function's parameter (here: the page's <code class="notranslate">hash</code>) is an empty string.</p>
<p dir="auto">This fixes some inconsistent behaviour of the website. In the example below, the first URL sets the <code class="notranslate">background</code> to <code class="notranslate">none</code> while in the second example it doesn't.</p>
<ul dir="auto">
<li><a href="https://www.openstreetmap.org/edit.html?background=none" rel="nofollow">https://www.openstreetmap.org/edit.html?background=none</a></li>
<li><a href="https://www.openstreetmap.org/edit.html?background=none#map=%E2%80%A6" rel="nofollow">https://www.openstreetmap.org/edit.html?background=none#map=…</a></li>
</ul>
<p dir="auto">With this PR, the <code class="notranslate">background</code> query parameter is ignored in both examples. The correct way to supply the <code class="notranslate">background</code> (and <a href="https://github.com/openstreetmap/openstreetmap-website/blob/c55d346/app/assets/javascripts/edit/id.js.erb#L23-L39">related parameters</a>) is via a hash parameter:</p>
<ul dir="auto">
<li><a href="https://www.openstreetmap.org/edit.html#background=none" rel="nofollow">https://www.openstreetmap.org/edit.html#background=none</a></li>
<li><a href="https://www.openstreetmap.org/edit.html#background=none&map=%E2%80%A6" rel="nofollow">https://www.openstreetmap.org/edit.html#background=none&map=…</a></li>
</ul>

<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/3571'>https://github.com/openstreetmap/openstreetmap-website/pull/3571</a></p>

<h4>Commit Summary</h4>
<ul>
  <li><a href="https://github.com/openstreetmap/openstreetmap-website/pull/3571/commits/66656e1d1d58e6073efd453007d7452920531b37" class="commit-link">66656e1</a>  only parse hashParams if there is a hash</li>
</ul>

<h4 style="display: inline-block">File Changes </h4> <p style="display: inline-block">(<a href="https://github.com/openstreetmap/openstreetmap-website/pull/3571/files">1 file</a>)</p>
<ul>
  <li>
    <strong>M</strong>
    <a href="https://github.com/openstreetmap/openstreetmap-website/pull/3571/files#diff-5c2b51e0ba5f2385195ba895842df7b083fc07b716e39a720f01d5a988edeefa">app/assets/javascripts/edit/id.js.erb</a>
    (3)
  </li>
</ul>

<h4>Patch Links:</h4>
<ul>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/3571.patch'>https://github.com/openstreetmap/openstreetmap-website/pull/3571.patch</a></li>
  <li><a href='https://github.com/openstreetmap/openstreetmap-website/pull/3571.diff'>https://github.com/openstreetmap/openstreetmap-website/pull/3571.diff</a></li>
</ul>

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