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.

Note: The itemref attribute is not part of the microdata data model. It is merely a syntactic construct to aid authors in adding 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 item while keeping the properties in the cells.


Representing structured data for a band

This example uses microdata attributes to represent the following structured data (in JSON-LD format):

  "@id": "amanda",
  "name": "Amanda",
  "band": {
    "@id": "b",
    "name": "Jazz Band",
    "size": 12


<div itemscope id="amanda" itemref="a b"></div>
<p id="a">Name: <span itemprop="name">Amanda</span></p>
<div id="b" itemprop="band" itemscope itemref="c"></div>
<div id="c">
  <p>Band: <span itemprop="name">Jazz Band</span></p>
  <p>Size: <span itemprop="size">12</span> players</p>



HTML Standard
# attr-itemref

See also