# Aside (complementary) landmark should be top-level or directly inside main. > Canonical HTML version: https://rocketvalidator.com/accessibility-validation/accesslint/0.16/landmarks/complementary-is-top-level > Attribution: Rocket Validator (https://rocketvalidator.com) > License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) The complementary landmark, defined by the `

` element or `role="complementary"`, is expected to be either a top-level landmark in the page structure or a direct child of the `

` landmark. When an `

` is nested deep inside other landmarks like `

`, `

`, or `