list-item: generate a block box and a inline box for the list markerA run-in box behaves as follows:If the run-in box contains a block box, the run-in box becomes a block box.If a sibling block box (that does not float and is not absolutely positioned) follows the run-in box, the run-in box becomes the first inline box of the block box. A run-in cannot run in to a block that already starts with a run-in or that itself is a run-in.Otherwise, the run-in box becomes a block box.