Chakavian
Chakavian in its actual use is the least spoken Serbo-Croatian dialect, being spoken only by 12% Croats. It is now mostly reduced in southwestern Croatia along the eastern Adriatic: Adriatic islands, and sporadically in the mainland coast, with rare inland enclaves up to central Croatia, and minor enclaves in Austria and Montenegro. All areas of old contacts with Romance languages.
Serbian language in Croatia
The Law on Use of Languages and Scripts of National Minorities provides for a mandatory co-official use of minority languages in municipalities of Croatia with at least one third of members of ethnic minoritiy. Municipalities Dvor, Gvozd, Jagodnjak, Šodolovci, Borovo, Trpinja, Markušica, Negoslavci, Biskupija, Ervenik, Kistanje, Gračac, Udbina, Vrbovsko, Donji Kukuruzari, Erdut and Vukovar, according to the provisions of law, are obliged to grant equal co-official use of Serbian language and Serbian Cyrillic alphabet. Law enforcement is facing great resistance in the part of the majority population, most notably in the case of Vukovar where it led to 2013 Anti-Cyrillic protests in Croatia.