Thickness of triple-border lines
The line thickness of border-style: triple can be specified by using -ah-border-triple-thickness. For instance, the thickness can be specified like: -ah-border-triple-thickness: 3pt 1pt 3pt 1pt 3pt. The values are outside line width, spacing, middle line width, spacing, and inside line width in order from left to right. If the value is omitted, it is considered to be equivalent to the preceding value. Negative values are not available. Borders with triple lines is available in Antenna House Formatter V7.3 and later.
border: triple 15pt; -ah-border-triple-thickness: 1;
border: triple 15pt; -ah-border-triple-thickness: 1pt;
border: triple 15pt; -ah-border-triple-thickness: 1pt 3pt;
border: triple 15pt; -ah-border-triple-thickness: 1pt 3pt 1pt 3pt 1pt;
border: triple 15pt; -ah-border-triple-thickness: 3pt 1pt 3pt 1pt 3pt;