div#app

header scoped to body

This should be the header element exposed as a banner.

Should not be a landmark

Main

Article

Should not be a landmark

Section

Should not be a landmark
Should not be a landmark

Blockquote

Should not be a landmark
details/summary

text...

Should not be a landmark
Fieldset
Figure
Should not be a landmark
Figcaption
Also should not be a landmark
A table cell Cell with header:
Should not be a landmark

A dialog element

Should not be a landmark