Use the cellborder attribute to set the width of the border for table cells in pixels. By default, the border for the cells is the same as for the table. Use the border attribute to set the border width for the table.
[2] WebTV 1.2 が実装していたが 2.1 は未実装 >>1
[4] <http://developer.apple.com/safari/library/documentation/AppleApplications/Reference/SafariHTMLRef/Articles/Attributes.html#//apple_ref/doc/uid/TP40008058-cellborder>
cellborder
Sets the width of the border of an individual table cell.
<table cellspacing=0 cellborder=0 style='width:100%'>