Documenting javascript functionality

Should we include things inherited from javascript like Object and Array methods? The options would be:
- Do not include
- Included one reference to mdn per main topic like [Objects](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)
- list the individual methods, etc deep linking to their corresponding mdn article - [assign](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign), .., [keys](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys)
- add our own documentation

Start by reviewing the proposed options in this issue for documenting inherited JavaScript Object and Array functionality, including the linked MDN references. Clarify which scope the project wants before changing documentation; done means the selected approach is agreed and documented consistently.

Written by the indexing model from the issue text.