| PASS Required arguments to createTreeWalker should be required. | |
| PASS Optional arguments to createTreeWalker should be optional (1 passed). | |
| PASS Optional arguments to createTreeWalker should be optional (2 passed). | |
| PASS Optional arguments to createTreeWalker should be optional (3 passed, null). | |
| PASS Optional arguments to createTreeWalker should be optional (3 passed, function). | |