This template's initial visibility currently defaults to autocollapse, meaning that if there is another collapsible item on the page (a navbox, sidebar, or table with the collapsible attribute), it is hidden apart from its title bar; if not, it is fully visible.
To change this template's initial visibility, the |state= parameter may be used:
{{Princesses of Parma by marriage|state=collapsed}}will show the template collapsed, i.e. hidden apart from its title bar.{{Princesses of Parma by marriage|state=expanded}}will show the template expanded, i.e. fully visible.
Note: Margherita de' Medici, Maria Amalia, Duchess of Parma, Princess Maria Pia of Bourbon-Two Sicilies (1849–1882), and Infanta Maria Antónia of Portugal never were Parmese princesses; they respectively married Odoardo Farnese, Duke of Parma, Ferdinand I, Duke of Parma, and Robert I, Duke of Parma after each became Duke. They are listed on Template:Ducal consorts of Parma.