Abstract: A computer-implemented method and program product of modifying and presenting document data (150). Sub-elements (180) of document elements (TA) are marked as “fixed” elements. When the document data is presented in a visible document area of a computer program processing the document, the fixed elements are presented as long as their associated document elements are presented at least partially. An example for a document element is a table (TA), and its sub-elements can be table headers (180), table rows, and table columns. The associated data used for the presentation are called sliding table headers (430), sliding rows, and sliding columns.