This option has no effect on the HTML output.
Headings are either all horizontal or all vertical.
Any sums are also rounded by the format, but they include only one rounding error, that of rounding the sum of the actual values. X has a format of 5.2. SAS procedures treat variables that have picture formats as character variables. Physical page size does not mean the same thing in HTML output as it does in traditional procedure output. However, if the data set contains a large number of variables but few observations, the PAGE value can increase the number of pages in the output.