itemref: HTML attribute

Properties that are not descendants of an item with the itemscope attribute can be associated with an item using the itemref attribute.

itemref provides a list of item IDs (not itemids) elsewhere in the document, with additional properties.

The itemref attribute can only be specified on items that have an itemscope attribute specified.

Note: The itemref attribute is not part of the microdata data model. It is simply a syntactic construct to help authors add annotations to pages where the data to be annotated does not follow a convenient tree structure. For example, it allows authors to mark up data in a table so that each column defines a separate element while maintaining properties in cells.