`main` landmark: must be top-level

Rule ID	Landmark 11
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.
Required	No for HTML4 Legacy Techniques ruleset mapping
WCAG Success Criteria	1.3.1 Info and Relationships (Level A, Primary Success Criterion) Other Related Success Criterion: 2.4.1 Bypass Blocks (Level A) 2.4.6 Headings and Labels (Level AA) 2.4.10 10 Section Headings (Level AAA)
Rule Category	Landmarks
Scope	Element
Target Resources	`main` landmark `main`
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.
Informational Links	Accessible Rich Internet Applications (WAI-ARIA) 1.1 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

main landmark: must be top-level