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

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/1406#pullrequestreview-15103286">vendor/assets/leaflet/leaflet.osm.js</a>:</p>
<pre style='color:#555'>> @@ -64,6 +64,16 @@ L.OSM.HOT = L.OSM.TileLayer.extend({
   }
 });
 
+L.OSM.GPS = L.OSM.TileLayer.extend({
+  options: {
+    url: document.location.protocol === 'https:' ?
+      'https://{s}.gps-tile.openstreetmap.org/lines/{z}/{x}/{y}.png' :
+      'http://{s}.gps-tile.openstreetmap.org/lines/{z}/{x}/{y}.png',
+    maxZoom: 20,
+    subdomains: 'abc'
+  }
+});
+
</pre>
<p>As a vendored library this needs to be patched upstream (at <a href="https://github.com/jfirebaugh/leaflet-osm">https://github.com/jfirebaugh/leaflet-osm</a>) first.</p>
<p>That rule basically applies to anything under the <code>vendor</code> directory - you can look in <code>Vendorfile</code> to see where they come from.</p>

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