tablebuild
This example demonstrates how to build an editable HTML table from structured data using D3 v7. It parses a dataset containing visit labels and numeric values, then dynamically generates table headers and rows with D3’s data join methods (`selectAll`, `enter`, `exit`). The table title and header cells are styled with inline D3 style properties. The code explicitly defines visit headers as a Set of objects, and the `tablbuild` function recreates the table each time it is called, using `Object.keys` and `Object.values` to map data into cells.