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

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5505#discussion_r1919121955">app/assets/javascripts/leaflet.map.js</a>:</p>
<pre style='color:#555'>> @@ -52,10 +57,12 @@ L.OSM.Map = L.Map.extend({
       code: "G"
     });
 
-    this.on("layeradd", function (event) {
-      if (this.baseLayers.indexOf(event.layer) >= 0) {
-        this.setMaxZoom(event.layer.options.maxZoom);
-      }
+    this.on("layeradd", function ({ layer }) {
+      if (this.baseLayers.indexOf(layer) < 0) return;
+      this.setMaxZoom(layer.options.maxZoom);
+      const key = document.querySelector(".key-ui");
</pre>
<p dir="auto">I've looked further into it, this is on me for having minified leaflet overwrite the <code class="notranslate">$</code> function.<br>
This works:</p>
<div class="highlight highlight-source-js" dir="auto"><pre class="notranslate"><span class="pl-en">jQuery</span><span class="pl-kos">(</span><span class="pl-s">".key-ui"</span><span class="pl-kos">)</span><span class="pl-kos">.</span><span class="pl-en">attr</span><span class="pl-kos">(</span><span class="pl-s">"class"</span><span class="pl-kos">,</span> <span class="pl-s">"key-ui "</span> <span class="pl-c1">+</span> <span class="pl-s1">layer</span><span class="pl-kos">.</span><span class="pl-c1">options</span><span class="pl-kos">.</span><span class="pl-c1">className</span><span class="pl-kos">)</span><span class="pl-kos">;</span></pre></div>

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