Multi-level Table Markup Builder

How to use Multi-level Table Markup Builder

Publish a table whose meaning depends on several row and column headings. You supply both hierarchies and the exact text matrix; the tool derives spans, distinct header IDs and the complete ancestor list for each data cell. It produces reviewable source and a printable artifact without mounting user HTML or claiming that header wiring alone certifies accessibility.

1. Author a caption and one-to-three-level row and column trees; leaves define matrix order.
2. Enter a rectangular string matrix with one row and column for every corresponding leaf.
3. Review per-cell header IDs and the generated spans, then test the final table with real readers and assistive technology.

Good to know

• At most 100,000 JSON characters, 100 tree nodes and 20 leaves per axis, three levels per axis and 400 data cells. Caption at most 200 characters, summary 1,000, header labels 100 and data strings 200. Unknown keys, duplicate JSON members and non-string matrix values are refused.
• A node has label and optional nonempty children. Leaves may have different depths. Source order controls visual order; repeated visible labels remain separate nodes with distinct generated IDs. The matrix must exactly match the row/column leaf counts.
• Generated data cells explicitly list all row and column ancestor IDs. Leaves use row/column scope; group associations use IDs instead of assuming a complete colgroup model. Rowspan/colspan values derive from the declared tree, not supplied markup.
• No arbitrary HTML, styles, scripts, dynamic sorting or data fetching is accepted. Document text refuses controls other than tabs and line endings. Very wide or deeply grouped tables may be better split; header meaning, real print fit and full accessibility require separate review. No WCAG certification is provided.
• Processing is local. Output is limited to 1,000,000 text characters unless a stricter file limit is stated.