WCAG Success Criterion: "For all components of the user interface. (including but not limited to: Form elements, links, and scripted components), the name and role can be determined by software; states, properties, and values that can be set by the user may be determined by software; and notification of changes to these elements is available to user agents, including assistive techniques."

For interactive elements, name, role and state should be determinable by assistive technologies. With this information, users can draw conclusions as to which actions are possible with an element and
how the element is operated. The elements for selecting appointments lack semantic information about the currently selected element. Due to the purely visual labeling, blind users cannot see which appointment selection is selected. For this reason, the element (marked red) should have an aria-current="true" attribute.