In building a custom set of layout tags, I found another answer to this problem. Provided here is the custom set of tags and their CSS classes.
HTML
<layout-table>
<layout-header>
<layout-column> 1 a</layout-column>
<layout-column> </layout-column>
<layout-column> 3 </layout-column>
<layout-column> 4 </layout-column>
</layout-header>
<layout-row>
<layout-column> a </layout-column>
<layout-column> a 1</layout-column>
<layout-column> a </layout-column>
<layout-column> a </layout-column>
</layout-row>
<layout-footer>
<layout-column> 1 </layout-column>
<layout-column> </layout-column>
<layout-column> 3 b</layout-column>
<layout-column> 4 </layout-column>
</layout-footer>
</layout-table>
CSS
layout-table
{
display : table;
clear : both;
table-layout : fixed;
width : 100%;
}
layout-table:unresolved
{
color : red;
border: 1px blue solid;
empty-cells : show;
}
layout-header, layout-footer, layout-row
{
display : table-row;
clear : both;
empty-cells : show;
width : 100%;
}
layout-column
{
display : table-column;
float : left;
width : 25%;
min-width : 25%;
empty-cells : show;
box-sizing: border-box;
/* border: 1px solid white; */
padding : 1px 1px 1px 1px;
}
layout-row:nth-child(even)
{
background-color : lightblue;
}
layout-row:hover
{ background-color: #f5f5f5 }
The key to getting empty cells and cells in general to be the right size, is Box-Sizing and Padding. Border will do the same thing as well, but creates a line in the row. Padding doesn't. And, while I haven't tried it, I think Margin will act the same way as Padding, in forcing and empty cell to be rendered properly.