What Internal Property In ECMAScript is defined for?

Question

What the Internal Property in ECMAScript is defined for ? What does the spec mean by

This specification uses various internal properties to define th

Answer 1

Does it mean that Internal properties defined by ECMAScript are not available for programming. They are used in the implementation of the javascript engine ?

Yes. They are only for implementation purposes, and don't need "real names". You can read about that in #8.6.2 Object Internal Properties and Methods.