1. Document Object Model Requirements

1.3 Document Manipulation

1. There will be a way to add, remove and change elements and/or tags (if permitted by the Document Type Definition and not precluded by security or validity considerations) in the document structure.
2. There will be a way to add, remove and change attributes (if permitted by the Document Type Definition and not precluded by security or validity considerations) in the document structure.
3. Operations (or a combination of operations) must restore consistency before they return.
4. A valid static document acted upon by the DOM will deliver a consistent reproducible document structure.