https://moji.or.jp/mojikibansearch/img/MJ/MJ<dddddd>.png instead of
https://mojikiban.ipa.go.jp/MJ<dddddd>.png as the URL of MJ
glyph-image.
          (while (re-search-forward "&\\(A-\\|o-\\|G-\\|g2-\\|R-\\)?MJ\\([0-9]+\\);" nil t)
            (setq code (string-to-int (match-string 2)))
            (replace-match
-            (format "<img alt=\"MJ%06d\" src=\"https://mojikiban.ipa.go.jp/MJ%06d.png\"
+            (format "<img alt=\"MJ%06d\" src=\"https://moji.or.jp/mojikibansearch/img/MJ/MJ%06d.png\"
 style=\"vertical-align:middle; width: 48px; height: 48px\">"
                     code
                     code