reader-resizable table column widths, reader-reorderable columns, reader-controlled show/hide for columns?

[jrus]

Many table views in GUI software (e.g. file managers, spreadsheets) allow viewers to resize columns by dragging left/right from a target in between column headers, reorder columns by dragging a column header itself, and show/hide desired columns via a menu presented for right-click in the header row.

Supporting these features (or some suitable variants that fit in a browser context) could make it a more flexible and pleasant tool for readers, and faster for exploratory data analysis.