标签：
if collapsing borders have the same style and width, but differ in color, then ... from most to least preferred: cell, row, row group, column, column group, table.
if ... come from same type of element, such as two rows... then color is taken from borders that are the topmost and the leftmost.
标签：
原文地址：http://www.cnblogs.com/gongziwuji/p/4746924.html
