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

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/6192#discussion_r2217316015">app/assets/javascripts/leaflet.share.js</a>:</p>
<pre style='color:#555'>> +          const contentType = blob.type;
+          let extension = "bin";
+          if (contentType === "image/png") extension = "png";
+          else if (contentType === "image/jpeg") extension = "jpg";
+          else if (contentType === "image/svg+xml") extension = "svg";
+          else if (contentType === "image/webp") extension = "webp";
+          else if (contentType === "application/pdf") extension = "pdf";
+          a.download = `map.${extension}`;
</pre>
<p dir="auto">Without a value in the download attribute, the browser will decide filename and extension from the blob type for object URLs (<a href="https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/a#download" rel="nofollow">MDN</a>), but with <code class="notranslate">download="map"</code> set the extension should still be determined from the <code class="notranslate">blob.type</code>.</p>

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