Where can I find the BOM specification or what can I use as a guide?

Question

JavaScript

I found the specification about DOM and about ecmascript too, but I can’t find anything about the browser object model, where is its documentation, how to learn bom ?

Answer 1

https://en.wikipedia.org/wiki/Browser_Object_Model
Unlike the Document Object Model, there is no standard for implementation and no strict definition, so browser vendors are free to implement the BOM in any way they wish.

Answer 2

But there are such structures and each object has some additional properties and methods, where do they come from, and where are they described?