<p></p>
<p><b>@hlfan</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5736#discussion_r1991848793">app/assets/javascripts/osm.js.erb</a>:</p>
<pre style='color:#555'>> @@ -100,6 +106,9 @@ OSM = {
       mapParams.lon = params.mlon;
       mapParams.lat = params.mlat;
       mapParams.zoom = params.zoom || 12;
+    } else if (geoURI.pathname) {
+      [mapParams.lat, mapParams.lon] = geoURI.pathname.split(",");
+      mapParams.zoom = geoURI.searchParams?.get("z") || Math.round(geoURI.pathname.replaceAll(/,?[-\d]+\./g, "").length / 0.6) - 2;
</pre>
<p dir="auto">Not entirely,</p>
<ul dir="auto">
<li>replaceAll takes the decimal places</li>
<li>and this / 0.6 - 2 is close enough to the inverse of <code class="notranslate">OSM.zoomPrecision()</code></li>
</ul>
<p dir="auto">I removed <code class="notranslate">Math.round(...)</code> to make this more clear.</p>

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