Accessibility in Blazor Tabs Component

24 Apr 20245 minutes to read

The Blazor Tabs component followed the accessibility guidelines and standards, including ADA, Section 508, WCAG 2.2 standards, and WCAG roles that are commonly used to evaluate accessibility.

The accessibility compliance for the Blazor Tabs component is outlined below.

Accessibility Criteria Compatibility
WCAG 2.2 Support Yes
Section 508 Support Yes
Screen Reader Support Yes
Right-To-Left Support Yes
Color Contrast  
Mobile Device Support  
Keyboard Navigation Support Yes
Axe-core Accessibility Validation Yes
Yes - All features of the component meet the requirement.
Partial - Some features of the component do not meet the requirement.
No - The component does not meet the requirement.

WAI-ARIA attributes

Blazor Tabs component is designed by considering WAI-ARIA standard. Tab is supported with ARIA Accessibility which is accessible by on-screen readers, and other assistive technology devices.

The following list of attributes are added in the Tab.

Attributes Purpose
tablist Attribute is set to the Tab header element that describes actual role of the element.
tab Attribute is set to the Tab items element to indicates an interactive element inside a tablist that, when activated, displays its associated tabpanel.
tabpanel This is set to role attribute for the Tab content that describes the role for viewing the active content.
aria-orientation Attribute is set to the Tab header element indicates the Tab header orientation. Default value of this attribute is horizontal.
aria-selected Attribute set to the Tab items to indicates the selection state for Tab items. Active Tab is set to true for this attribute.
aria-labelledby Attribute is set to the Tab content element to indicates the associated Tab header for the content.
aria-controls Attribute is set to the Tab items element to indicates the associated tabpanel for the header.
aria-haspopup Attribute is set to the Popup element to indicates the popup mode in the Tab. The default value of this attribute is false. If popup mode is enabled, the attribute value is set to true.
aria-disabled Attribute set to the Tab items to It indicates the disabled state of the Tab.

Keyboard interaction

By default, keyboard navigation is enabled. This component implements keyboard navigation support by following the WAI-ARIA practices. Once focused on the active Tab element, you can use the following key combination for interacting with the Tab.

Keyboard shortcuts Actions
Left Moves focus to the previous Tab. If focus is on the first Tab, the focus will not move to any Tab.
Right Moves focus to the next Tab. If focus is on the last Tab element, the focus will not move to any Tab.
Enter or Space Selects the Tab if it is not selected. Opens the popup dropdown icon if it is focused. Select the Tab item as active when popup item is focused.
Esc(Escape) Closes the popup if popup is in opened state.
Down or Up When the popup is open and focused, it will move to previous or next Tab items of the popup in the vertical direction.
Home Moves focus to the first Tab.
End Moves focus to the last Tab.
Shift + F10 If popup mode is enabled, it opens the popup when the Tab is focused.
Delete Deletes the Tab, if close button is enabled in Tab header.

Ensuring accessibility

The Blazor Tabs component’s accessibility levels are ensured through an axe-core software tool during automated testing.

The accessibility compliance of the Tabs component is shown in the following sample. Open the sample in a new window to evaluate the accessibility of the Tabs component with accessibility tools.

See also