This is the header (banner role). There should only be one. Branding should be here. It should be a top level element. The only landmarks that can be here are navigation, region, or search
Here's a div role=search. The only landmark allowed here is region
Starting main. There must be at least one main. It must be top-level. Starting main. There must be at least one main. It must be top-level. Starting main. There must be at least one main. It must be top-level. This is some main text. This is sn text. This is some main text. This is some main text. This is some main text. This is some main text. This is some main text. This is some main text. This is some main text. This is some main text. This is some main text. Ending main

Here's the H1

section start

This is the h2

end of section
This is the form, which should be contained within another landmark. Only landmark type allowed in a form is region.
end of main