Can anyone post the reference where private and protected variables are DESCRIBED (not just mentioned)

Question

SoloLearn says these are the JS keywords. Still I can not find respective articles on the Internet

Answer 1

I don't know if this will help but this guy is somehow involved in JavaScript and JSON developement and although this is from 2001, I'm sure it's still relevant:
javascript.crockford.com/private.html

Answer 2

private and protected and even public are used in JAVA and not java script

Answer 3

that is not available in javascript