| PASS | an attribute set by setAttribute should be accessible as a field on the `attributes` field of an Element | |
| PASS | setNamedItem and removeNamedItem on `attributes` should add and remove fields from `attributes` | |
| PASS | setNamedItem and removeNamedItem on `attributes` should not interfere with existing method names | |
| PASS | an attribute with a null namespace should be accessible as a field on the `attributes` field of an Element | |
| PASS | an attribute with a set namespace should be accessible as a field on the `attributes` field of an Element | |
| PASS | setting an attribute should not overwrite the methods of an `NamedNodeMap` object | |
| PASS | setting an attribute should not overwrite the methods defined by prototype ancestors of an `NamedNodeMap` object | |
| PASS | setting an attribute should not overwrite the length property of an `NamedNodeMap` object | |