Candidate Set:

Any element that has the aria-checked attribute

Except:

option elements
elements with  type=radio attribute
elements with  type=checkbox attribute
elements with  type=menuitemcheckbox attribute
elements  element with  type=menuitemradio attribute
elements with the aria role="option"
elements with the aria role="menuitem"
elements with the aria role="radio"
elements with the aria role="checkbox"
elements with the aria role="treeitem"