This is not the final website. It is a demo of the real tool working, made for Y Combinator.
AxisRemedy

15-002 A column has a header cell, but that header cell is not tagged as a header.

A column header cell is not tagged as a header.

Checkpoint
15: Tables
ISO 14289-1 (PDF/UA-1) clause
7.5-1
Test type in the protocol
Needs a human judgement
Applies to
A single object

How AxisRemedy handles it

Left for you, with screening. A person has to judge this one. AxisRemedy looks for signs of a problem and lists the places to look at, with the page and a box around the spot. It never reports a pass or a fail for this condition.