Possible values are none for no inner borders, groups for borders between row groups and column groups only, rows for borders between rows only, cols for borders between columns only, and all for borders between all cells. A percentage value is relative to the vertical space available for vertical padding or spacing, and the amount is split evenly between the top and bottom. Horizontal padding and spacing behave similarly. The padding or spacing is always applied to all four sides. Possible values are left , right , and center .
Style sheets provide a safer, more flexible method of specifying a table's background color.
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