Incorrect error message selected for parent element restriction #25499
Description
As a follow up to #25339 (comment),
In this example:
<!-- Invalid: submenus cannot be inside an amp-accordion -->
| <amp-accordion>
| <section>
| <h4>accordion header</h4>
| <div>
| <h4 amp-nested-submenu-open></h4>
| <div amp-nested-submenu></div>
>> ^~~~~~~~~
amp-nested-menu/0.1/test/validator-amp-nested-menu-error.html:59:12 The attribute 'amp-nested-submenu' may not appear in tag 'div'.
The real error is that divs containing the amp-nested-submenu attribute should not be a child of accordion, not that "The attribute 'amp-nested-submenu' may not appear in tag 'div'." The error message is misleading, since the amp-nested-submenu attribute is actually supposed to be used with a div.