Visible and Hidden

The following is a table with six rows (Row-1 to Row-6). Verify that rows 1,2,4 and 6 are visible, 3 and 5 are hidden. Verify that though rows 3 and 5 are not visible, they affect the lay-out of the table.

Table
Row-1
Row-2
Row-3
Row-4
Row-5
Row-6

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