[openstreetmap/openstreetmap-website] Propagate iD title to parent (PR #5865)

[Anton Khorev]

@AntonKhorev commented on this pull request.



> @@ -76,5 +76,10 @@ document.addEventListener("DOMContentLoaded", function () {
       const data = parent.OSM.mapParams();
       goToLocation(data);
     });
+
+    const projectTitle = parent.document.title;
+    new MutationObserver(() =>
+      parent.document.title = [document.title, projectTitle].filter(t => t).join(" | ")
+    ).observe(document.querySelector("title"), { childList: true, characterData: true });

I don't know why you removed `subtree` and how `characterData` is going to work without it.

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