Bug 1451157: [BC] border-bottom of table cell missing if rowspan attribute value incorrect

The border-bottom of table cell is missing if/when rowspan attribute value is incorrectly too high

col1 row1col2 row1; cell with rowspan="3"
col1 row2

Chromium 64.0.3282.119 renders the border-bottom of table cell even if/when rowspan attribute value is incorrectly too high.

Firefox 52.7.3 ESR and Firefox 61.0a1 buildID=20180401100341 do not render the border-bottom of table cell if/when rowspan attribute value is incorrectly too high.

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