HTML aside element

The <aside> HTML element represents a portion of a document whose content is only indirectly related to the document’s main content. Asides are frequently presented as sidebars or call-out boxes.

Do not use the <aside> element to tag parenthesized text, as this kind of text is considered part of the main flow. The <aside> element has an implicit role of complementary, unless it has no accessible name and is nested in sectioning content, in which case it has the generic role.