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

[Anton Khorev]

@AntonKhorev commented on this pull request.



> @@ -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 });

Maybe also watch for `characterData`. 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.

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