https://www.lumar.io/wiki/accessibility/semantics-bp/landmark-one-main/
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https://www.lumar.io/wiki/accessibility/semantics-bp/landmark-main-is-top-level/
Main landmark not top level (A11y Best Practice Violation) - Web Accessibility Wiki
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https://www.w3.org/WAI/ARIA/apg/patterns/landmarks/examples/main.html
Main Landmark: ARIA Landmarks Example
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