Document other inherited web preferences

docs/api/window-open.md

@@ -30,6 +30,10 @@ has to be a field of `BrowserWindow`'s options.
 
 * Node integration will always be disabled in the opened `window` if it is
   disabled on the parent window.
+* Context isolation will always be enabled in the opened `window` if it is
+  enabled on the parent window.
+* JavaScript will always be disabled in the opened `window` if it is disabled on
+  the parent window.
 * Non-standard features (that are not handled by Chromium or Electron) given in
   `features` will be passed to any registered `webContent`'s `new-window` event
   handler in the `additionalFeatures` argument.