Slavs
Standardised Slavic languages that have official status in at least one country are: Belarusian, Bosnian, Bulgarian, Croatian, Czech, Macedonian, Montenegrin, Polish, Russian, Serbian, Slovak, Slovene, and Ukrainian.
Serbian language in Croatia
The Serbian language is one of the officially recognized minority languages in Croatia. It is primarily used by the Serbs of Croatia. The Croatian Constitution, Croatian Constitutional law on national minorities rights, Law on Education in language and script of national minorities and Law on Use of Languages and Scripts of National Minorities define the public co-official usage of Serbian in Croatia. Serbian and Croatian are two standardized varieties of the pluricentric Serbo-Croatian language. Majority of Serbs of Croatia use Ijekavian pronunciation of Proto-Slavic vowel jat except in the Podunavlje region in Vukovar-Srijem and Osijek-Baranja Counties where local Serb population use Ekavian pronunciation. Post-World War II and Croatian War of Independence settlers in Podunavlje which have come from Bosnia, Dalmatia or Western Slavonia either use their original Ijekavian pronunciation, adopted Ekavian pronunciation or both of them depending on context. In 2011 Census majority of Serbs of Croatia declared Croatian standardized variety as their first language with Ijekavian pronunciation always being required standard form in Croatian. While Serbian variety recognizes both pronunciations as standard Ekavian is the more common one as it is the dominant one in Serbia, with Ijekavian being mostly limited to Republika Srpska in Bosnia, Montenegro and Croatia.