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

<hr>

<p>In <a href="https://github.com/openstreetmap/openstreetmap-website/pull/5865#discussion_r2020221803">app/assets/javascripts/id.js</a>:</p>
<pre style='color:#555'>> @@ -76,5 +76,13 @@ document.addEventListener("DOMContentLoaded", function () {
       const data = parent.OSM.mapParams();
       goToLocation(data);
     });
+
+    const firstParentTitle = parent.document.title;
+    new MutationObserver(function (mutations) {
+      if (!mutations.some(mutation => mutation.target.tagName === "TITLE")) return;
+      const newTitle = `${document.title} | ${firstParentTitle}`;
+      if (parent.document.title === newTitle) return;
+      parent.document.title = newTitle;
+    }).observe(document.head, { childList: true, subtree: true });
</pre>
<p dir="auto">Maybe also watch for <code class="notranslate">characterData</code>. Currently there's no difference because the title is changed by deleting the text node and creating a new one, but its going to be undetected if done by a node value change. I don't know how likely it's for iD to do that.</p>

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