| PASS if no crash. | |
| After initial layout: A multicol has a column-span:all descendant (not a direct child, so that we establish block continuations and anonymous multi-column blocks) | |
| Turn a child of this multicol container into a multicol | |
| Add another column-span:all descendant (again, not a direct child, so that we get more continuations) | |
| Set display:none on everything |