Board Thread:Support Requests - Designing Your Wiki/@comment-1536121-20130224043231/@comment-3147293-20130226095951

There are two reasons why that doesn't work:
 * 1)   works only inside a table.
 * 2) Some old HTML codes including   are no longer effective since Wikia has upgraded its engine to MW 1.19.

If you just want to divide the cell in two parts, how about using ? It is the easiest and most stable way to do that. You add  to all of the cells in the same column except the row that you want to take up two cells.