How to show TableRow's border, but not TableCells' - html

Question

I'm working on a dynamically generated table atm. The CSS-File looks like this:
...
td {
border: 1px solid white;
}
tr {
border: 1px solid black;
font-family: Arial;
}
table {
width: 850px;
border-spacing: 8px 8px;
border: 1px solid black;
margin-left: auto;
margin-right: auto;
text-align: center;
}
...
I don't want to see the border of the cells, BUT the cells need to be there, because they are a placeholder, so I change their color to white.
My problem is that I don't know why the border of the rows won't get displayed. Or let's say, is it possible to display the row's border, but not the cells'?

Answer 1

Since different browsers behave differently, where table borders are concerned, I found it always more consistent, to put the borders to the top/bottom of the cells instead of the rows:
td {
border-bottom: 1px solid #000;
}
Since this will draw the top border of each cell, it will look like the row has a border(-bottom).
To add another border to the very top:
tr:first-child td {
border-top: 1px solid #000;
}
Finally, if you need the left and right borders too, add them to the first/last cell of each row:
td:first-child {
border-left: 1px solid #000;
}
td:last-child {
border-right: 1px solid #000;
}
Sorry, if this looks clumsy, but in my experience this will work better than trying to force the rows to display a correct border.

Answer 2

Please try this:
tr {
outline: thin solid black
font-family: Arial;
}

Answer 3

tr{
outline : 1px solid black;
}