Putting the "progression" class on a <table> tag creates a menu with widgets to step through the <row> or <tbody> direct child elements. This is demonstrated by selecting the "Example" menu item. The code for the demonstration example can be viewed by selecting the "Code" menu item.
When the only direct child of the <table> tag is a <tbody> tag the progression items are the direct child elements of the <tbody> tag the <row> elements. This is illustrated in the "Single TBody" menu item.