Target div with only-child

That is probably the best we can do without resolving to convoluted and complex selectors.

Author: JayPanoz

css/src/modules/user-settings-submodules/ReadiumCSS-fontSize_pref.css

@@ -21,6 +21,12 @@
   :root:not(:--deprecated-font-size):not(:--iOS-patch)[style*="--USER__fontSize"] figure:has(> canvas),
   :root:not(:--deprecated-font-size):not(:--iOS-patch)[style*="--USER__fontSize"] figure:has(> iframe),
   :root:not(:--deprecated-font-size):not(:--iOS-patch)[style*="--USER__fontSize"] figure:has(> audio),
+  :root:not(:--deprecated-font-size):not(:--iOS-patch)[style*="--USER__fontSize"] div:has(> img:only-child),
+  :root:not(:--deprecated-font-size):not(:--iOS-patch)[style*="--USER__fontSize"] div:has(> video:only-child),
+  :root:not(:--deprecated-font-size):not(:--iOS-patch)[style*="--USER__fontSize"] div:has(> svg:only-child),
+  :root:not(:--deprecated-font-size):not(:--iOS-patch)[style*="--USER__fontSize"] div:has(> canvas:only-child),
+  :root:not(:--deprecated-font-size):not(:--iOS-patch)[style*="--USER__fontSize"] div:has(> iframe:only-child),
+  :root:not(:--deprecated-font-size):not(:--iOS-patch)[style*="--USER__fontSize"] div:has(> audio:only-child),
   :root:not(:--deprecated-font-size):not(:--iOS-patch)[style*="--USER__fontSize"] table {
     zoom: calc(100% / var(--USER__fontSize)) !important;
   }

css/src/modules/user-settings-submodules/ReadiumCSS-webPubZoom_pref.css

@@ -21,6 +21,12 @@
   :root:not(:--iOS-patch)[style*="--USER__zoom"] figure:has(> canvas),
   :root:not(:--iOS-patch)[style*="--USER__zoom"] figure:has(> iframe),
   :root:not(:--iOS-patch)[style*="--USER__zoom"] figure:has(> audio),
+  :root:not(:--iOS-patch)[style*="--USER__zoom"] div:has(> img:only-child),
+  :root:not(:--iOS-patch)[style*="--USER__zoom"] div:has(> video:only-child),
+  :root:not(:--iOS-patch)[style*="--USER__zoom"] div:has(> svg:only-child),
+  :root:not(:--iOS-patch)[style*="--USER__zoom"] div:has(> canvas:only-child),
+  :root:not(:--iOS-patch)[style*="--USER__zoom"] div:has(> iframe:only-child),
+  :root:not(:--iOS-patch)[style*="--USER__zoom"] div:has(> audio:only-child),
   :root:not(:--iOS-patch)[style*="--USER__zoom"] table {
     zoom: calc(100% / var(--USER__zoom)) !important;
   }