<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_r1919040815">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 tried that multiple ways, but jQuery-based variants always errored out, so I just left it this way.</p>

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