This is a good idea, but I'd be selective about it. There's a lot of tedious and uninteresting (IMO) stuff in there, like https://tc39.es/ecma262/#sec-array.pro

This is a good idea, but I'd be selective about it. There's a lot of tedious and uninteresting (IMO) stuff in there, like https://tc39.es/ecma262/#sec-array.prototype.splice https://tc39.es/ecma262/#sec-array.prototype.splice or how unicode is handled in the source text. But looking into the details of how object prototypes and properties really work is essential for getting a good grasp of the language.