Supplementary Content
Micro-semantics (passage level) Supplementary Content
Supplementary Content is additional page content (menus, links, ads, sidebars) that doesn't directly serve the page's main purpose.
Supplementary Content serves as 'semantic bridges' in the OUTER section: 2-3 intro sentences plus internal link to related articles. SC constitutes about 20-30% of the page, while MC represents 70-80%.
Too much SC (like mega menus of 1.8 MB) consumes crawl budget and obscures the actual content. Supplementary Content is tied to site architecture — proper SC builds internal linking networks that strengthen Topical Authority.
Source: AI Semantic SEO Expert, Robert Niechciał (sensai.io)