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Applicability
This rule applies to any aria-controls attribute defined on an [HTML element][namespaced element] for which one of the following is true:
expanded combobox: the element is a semantic combobox with an aria-expanded attribute value of true; or
scrollbar: the element is a semantic scrollbar.
Expectation
Each test target’s attribute value is a space-separated list of one or more IDs. At least one of those IDs must match an id attribute value in the same shadow tree or, if not within a shadow tree, within the same document.