| foobarbaz | |
| Success: window.getSelection() is ar. | |
| Success: s.extend(span2.firstChild, 4) raised Error: IndexSizeError: DOM Exception 1. | |
| Success: s.extend(span2.firstChild, -1) raised Error: IndexSizeError: DOM Exception 1. | |
| Success: window.getSelection() is b. | |
| Success: window.getSelection() is arbaz. | |
| Success: s.extend() raised Error: TypeMismatchError: DOM Exception 17. | |
| Success: s.extend(null, 0) raised Error: TypeMismatchError: DOM Exception 17. |