You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
alternatehistory.com
Here is the map where it shows the distribution of South Slavic dialects before the 16th century migrations due to the intrusion from the Ottoman Empire (and the wars that followed):
Here is the question: Will this distribution remain the same if the Byzantine Empire has survived (well, at least until the 19th century)? Will it affect the development of the Croatian language (and Serbian language,too)?
I asked this because I saw a map of Europe in a Byzantine-centred TL were the Byzantine Empire shared a border with the Serbian Kingdom in the world and the OTL present-day territory were under Hungary.