| PASS | When the parent is null, parentElement should be null | |
| PASS | When the parent is a document, parentElement should be null (doctype) | |
| PASS | When the parent is a document, parentElement should be null (element) | |
| PASS | When the parent is a document, parentElement should be null (comment) | |
| PASS | parentElement should return null for children of DocumentFragments (element) | |
| PASS | parentElement should return null for children of DocumentFragments (text) | |
| PASS | parentElement should work correctly with DocumentFragments (element) | |
| PASS | parentElement should work correctly with DocumentFragments (text) | |
| PASS | parentElement should work correctly in disconnected subtrees (element) | |
| PASS | parentElement should work correctly in disconnected subtrees (text) | |
| PASS | parentElement should work correctly in a document (element) | |
| PASS | parentElement should work correctly in a document (text) | |