Source: Schema.org v30.1 vocabulary. Official mainContentOfPage property definition.
What does mainContentOfPage mean?
Indicates if this web page element is the main subject of the page.
Used on types (domainIncludes)
Expected value types (rangeIncludes)
Schema.org domainIncludes and rangeIncludes are descriptive guidance, not strict validation prohibitions. Check the official reference for updates.
Related reference
Browse all Schema.org types and properties · Google feature support status