Rocket Validator looks for accesibility violations on your pages using the axe-core accessibility engine, hosted on our own servers and integrated into our web crawler. You don't need to buy an additional license, everything's already included in your Pro account at Rocket Validator.
WCAG: Best Practice: Complementary landmarks and/or asides are top level
Ensures the complementary landmark or aside is at top level
Complementary content is ancillary content to the main theme of a document or page. Screen reader users have the option to skip over complementary content when it appears at the top level of the accessibility API. Embedding an
<aside>element in another landmark may disable screen reader functionality allowing users to navigate through complementary content.