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

09-002 Structure elements are nested in a semantically inappropriate manner. (e.g., a table inside a heading).

Structure elements are nested in a way that makes no sense, such as a table inside a heading.

Checkpoint
09: Appropriate Tags
ISO 14289-1 (PDF/UA-1) clause
7.2-1
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.