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Landmark is a web interface concept that helps browsers structure, style, and adapt pages for users.
Landmark matters because most visual bugs come from unclear markup, layout rules, responsive behavior, or accessibility details. It gives builders a precise word for the thing they are changing, debugging, reviewing, or shipping.
Plainly
Think of Landmark as a rule or shape that decides how the page looks and behaves. It gives one small job a clear name so the whole app is easier to understand.
In practice
Use it while checking whether text fits, controls are clickable, mobile layouts wrap, and screen readers get useful structure. In practice, name the owner, input, output, failure mode, and proof before relying on Landmark.