The TR.rowIndex property is the vertical coordinate for cells in this row measured across the entire table.

This property yields a zero-based index number for this table row within the rows[] collection belonging to the TABLE object the row is a member of.

Note that this index will not hold true for the rows[] collections belonging to THEAD, TBODY and TFOOT objects. For that, you should inspect the sectionRowIndex property.

Property attributes:

ReadOnly.