Accessibility in Blazor Accordion Component

23 Jan 20232 minutes to read

The Blazor Accordion component has been designed keeping in mind the WAI-ARIA specifications, by applying the prompt WAI-ARIA roles, states and properties along with the keyboard support. Thus, making it usable for people who use assistive WAI-ARIA Accessibility supports that is achieved through the attributes like aria-labelledby, It helps to provides information about the elements in a document for assistive technology. The component implements the keyboard navigation support by following the WAI-ARIA practices and tested in major screen readers.

ARIA attributes

Property	Functionality
role	Button: Attribute is set to the Accordion header elements to indicate that the element can be used to toggle the visibility of the associated content section, describing the actual role of the element. Region: Attribute is set to the Accordion panel elements to create a landmark region that contains the currently expanded accordion panel, describing the actual role of the element.
aria-labelledby	Attribute is set to content (panel) and it points to the corresponding Accordion header.
aria-controls	Attribute is set to the header and it points to the corresponding Accordion content.
aria-expanded	Attribute is set to the Accordion header elements to indicates the expand state of the Accordion Item. Default value of this attribute is false. If an item is expanded, the attribute value changes to ‘true’.
aria-hidden	Attribute is set to the Accordion panel elements to indicates the content visible state of the Accordion Item. Default value of this attribute is true. If an item content is visible, the attribute value changes to false.
aria-disabled	It indicates the disabled state of the Accordion and its items.

Keyboard interaction

Keyboard navigation is enabled by default. The possible keys are:

Key	Description
Space or Enter	When the focus is on the Accordion header, clicking on the focused element makes the element to expand and collapse.
Down Arrow	Focus the next Accordion header.
Up Arrow	Focus the previous Accordion header.
Home	Focus the first Accordion header.
End	Focus the last Accordion header.