Rule: `main` landmark: must be top-level

Rule ID	Landmark 11
Conformance	Required
Definition	The `main` landmark must be a top-level landmark.
Purpose	Top-level landmarks are the easiest landmarks to find and navigate to using assistive technologies.
Conformance	Required
WCAG Success Criteria	Success Criterion 1.3.1 Info and Relationships Other Related Success Criterion: Success Criterion 2.4.1 Bypass Blocks Success Criterion 2.4.6 Headings and Labels Success Criterion 2.4.10 Section Headings
Rule Category	Landmarks
Rule Scope	Element
Techniques	When creating the landmark structure on the page, ensure that the `main` landmark is a top-level landmark (i.e., it is not contained within any other landmarks). The `main` element or an element with `[role="main"]` attribute defines a `main` landmark.
Information Links	Accessible Rich Internet Applications (WAI-ARIA) 1.2 Specification: main role HTML5: The MAIN element WAI-ARIA Authoring Practices 1.2: Landmarks WAI-ARIA Authoring Practices 1.2: Landmark Example W3C Web Accessibility Tutorials: Page Structure ARIA11: Using ARIA landmarks to identify regions of a page

Rule: main landmark: must be top-level