I didn’t know how to name this topic, because it’s my question what that is at all. So I have found this website while looking for Sorbian materials. At first I didn’t know what language that was, though I was surprised I could understand most of it. I’ve never seen a Slavic language like this before so that’s why I was so confused. During reading it became quite clear that it’s Slovenian (mainly because of words like ‘in’, ‘kot’, ‘vse’, dual number ‘nista’, etc. and the name of the language ‘Slovensko’ at the top..)
What I’ve deduced is that this orthography uses one character for one vowel phoneme (which isn’t true in standard Slovenian.) Probably:
a - /a/
e - /e/, ẹ - /ɛ/ (or the other way?)
o - /o/, ọ - /ɔ/ (or the other way?)
i - /i/
u - /u/
ə - /ə/
My questions: What is this magic? Is it a thing in Slovenia? How popular is it? Etc.