YouTube blocks scripts loaded from other domains, so this bookmarklet contains all its logic inline. It runs in your browser on the YouTube page and grabs the transcript directly.
If drag-drop misbehaves: right-click the button → Bookmark link (or Add to bookmarks). If you already had an old "Analyse with CDMTrak" bookmark, delete it and add this one — they look the same but the new one has the full logic inline.