Read itemref - HTML: HyperText Markup Language (developer.mozilla.org)
Properties that are not descendants of an element with the itemscope attribute can be associated with an item using the global attribute itemref.

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

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

ᔥ btrem in #microformats 2020-12-14 (2020-12-14 23:43:18)