13.16.4 Removing full-row straddles from tables
If you straddle all the cells in a table row in FrameMaker, you end up with a hidden “empty” row; the presence of this row is detectable only on the table context menu, which shows Unstraddle instead of Straddle when you select the row, or any cell in that row. However, MIF output generated for the table does include the empty row; and empty rows are not allowed for W3C validation.
You must unstraddle the entire row, remove the resulting empty row, and restraddle any cells that might still need straddling.
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