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

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5426#discussion_r1899531743">app/assets/javascripts/leaflet.layers.js</a>:</p>
<pre style='color:#555'>> @@ -31,6 +31,9 @@ L.OSM.layers = function (options) {
         var miniMap = L.map(mapContainer[0], { attributionControl: false, zoomControl: false, keyboard: false })
           .addLayer(new layer.constructor(layer.options));
 
+        if (layer.options.schemeClass) miniMap.getPane("tilePane").classList.add(layer.options.schemeClass);
+        miniMap.getPane("tilePane").style.setProperty("--dark-mode-map-filter", layer.options.filter || "none");
</pre>
<p dir="auto">Since the opinions in <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="2661819843" data-permission-text="Title is private" data-url="https://github.com/openstreetmap/openstreetmap-website/issues/5328" data-hovercard-type="issue" data-hovercard-url="/openstreetmap/openstreetmap-website/issues/5328/hovercard" href="https://github.com/openstreetmap/openstreetmap-website/issues/5328">#5328</a> varied wildly, I wanted to have an easy flag for other devs that an alternate tileset has been loaded, since some might like a different styling like I already mentioned in <a class="issue-link js-issue-link" data-error-text="Failed to load title" data-id="2736705476" data-permission-text="Title is private" data-url="https://github.com/openstreetmap/openstreetmap-website/issues/5396" data-hovercard-type="pull_request" data-hovercard-url="/openstreetmap/openstreetmap-website/pull/5396/hovercard" href="https://github.com/openstreetmap/openstreetmap-website/pull/5396#issue-2736705476">#5396 (comment)</a>.<br>
You are correct in that it doesn't do anything on the unmodified site.</p>

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