<bmx-pivot-grid>
A multi-dimensional pivot grid.
Everything is live. Open and close regions and years with their arrows (or the arrow keys), open
the field list with its tool to drag fields between Filters, Columns, Rows and Values, click a heading at the top
left to sort and filter, and double-click a total to drill through to its records.
Every property, event and method: https://docs.binarymission.co.uk/webcomponents/bmx/bmx-pivot-grid.html