Multi Select Table of Contents

• Accessibility support
• Development considerations
• Tests

Accessibility support# Keyboard Combobox Key / stateFunctionDown Arrow Up Arrow Space- Opens the listbox if it is not already displayed without moving focus or changing selection.
- DOM focus remains on the combobox. Listbox Key / stateFunctionDown Arrow Up ArrowMoves visual focus to the next/previous option.Home EndMoves visual focus to the first/last option.ESCCloses listboxEnterSelects an option ARIA enhancements Internal ARIA that is managed by the component: ARIAUsagearia-labelledby="IDREF"References the accessible name of the combobox.aria-describedby="IDREF"References the accessible description and status messages of the combobox.aria-label="STRING"References the accessible name of the listbox.role="status", role="alert"When message and state prop change, the status message is announced.aria-expanded="BOOLEAN"Indicates that the listbox element is displayed/hidden.aria-controls="IDREF"Identifies the element that serves as the listbox.aria-hidden="true"If required attribute is set, the visible indicator is hidden from assistive technologies.aria-multiselectable="true"Indicates that more than one item from the current selectable descendants can be selected.aria-autocomplete="list"Indicates that user input effects results of listbox.aria-haspopup="listbox"Indicates that the combobox will open a listbox.aria-required="true"Indicates if the element is required. Development considerations# Disabled state In general, you should prevent using the disabled state. Disabled elements are not reachable (focusable) anymore and can be missed by screen reader users. They can be confusing for sighted users as well by not pointing out why these elements are disabled. Tests# Automated TechnologySupportAXE-Core (WCAG 2.2 AA, Best-Practice)✅High-Contrast Mode (light/dark)✅Text-Zoom (200%)✅ Manual TechnologySupportKeyboard✅Screen reader (VoiceOver, NVDA)✅ (Note: Though Safari supports ariaActiveDescendantElement the active option doesn't get announced in VoiceOver)