At the moment, if I try to edit a page with <pgn> using Visual Editor, I see some issues:

• "JavaScript is not enabled on this page" is shown at the bottom. This is clearly wrong and must not be shown. (See T282503)
• The tag is shown as a generic inspector, which shows a tiny window for editing raw PGN source. It should at least be larger.
• As a nice option, the metadata such as Event, Site, Date, etc., should be editable as a form. This would be comparable to the form for adding a math formula, but for PGN it's probably much simpler.
• As an even nicer option, it should be possible to edit the FEN visually, by clicking on a chess board