Scrollable works with resizableColumns, reorderableColumns,

   sortable, columnResizeMode, scrollHeight, scrollWidth, header,footer, filter, paginator, selectionMode,
  expandableRows with inner table and column toggler.

  Fixed footer width and partially pagination width when scrollWidth is used

Fixes issues with scrollable:
-DataTable with scroll and few data causes headers and table cells to misalign #917
-dataTable when scrollable and scrollheight is set - style issue #465
-Column Reorder and Resize support for Scrollable DataTable #238
-Maybe: DataTable with explicit widths causes headers and table cells to misalign #487
-Maybe: Datatable scrollable="true" breaks column template header #859