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chromium/content/test/data/accessibility/html/header-inside-other-section.html 

<!DOCTYPE html>
<!--
@MAC-ALLOW:AXRoleDescription
@UIA-WIN-ALLOW:LocalizedControlType='section header'
@WIN-ALLOW:localized_extended_role='header'
@WIN-ALLOW:xml-roles:*
@AURALINUX-ALLOW:xml-roles:*
-->
<article>
  <header>
    <p>Header inside article.</p>
  </header>
</article>
<section>
  <header>
    <p>Header inside section.</p>
  </header>
</section>
<main>
  <header>
    <p>Header inside main.</p>
  </header>
</main>