Accessibility

This document provides information about the accessibility features implemented in the CP Library filter system. These enhancements help ensure that the filter functionality is usable by people with a wide range of abilities.

Keyboard Navigation

The filter system has been enhanced to support full keyboard navigation:

1. Filter Buttons: All filter buttons can be navigated to using the Tab key and activated using Enter or Space.
2. Dropdowns: When a dropdown is opened, focus moves to the first checkbox inside the dropdown.
3. Checkboxes: Users can navigate between checkboxes using Tab and activate them using Space.
4. Escape Key: Pressing Escape when inside an open dropdown will close the dropdown and return focus to the trigger button.
5. Search Input: The search input is fully keyboard accessible and can be submitted with Enter.
6. Selected Filters: All selected filter buttons can be navigated to and activated using the keyboard.
7. Pagination: Pagination controls are fully keyboard accessible with clear focus indicators.

Screen Reader Support

Several features have been added to improve the experience for screen reader users:

1. ARIA Attributes: Key components include appropriate ARIA roles, states, and properties:

   • role="button" for clickable elements
   • aria-haspopup="true" and aria-expanded for dropdown triggers
   • aria-controls to associate triggers with their corresponding content
   • aria-label for improved context where needed
   • role="menu" and role="menuitem" for dropdown options

2. Live Regions: The filter system uses ARIA live regions to announce:

   • When filters are selected or unselected
   • When search is performed
   • When content is loading
   • When new results are loaded

3. Focus Management: Proper focus management ensures that users are:

   • Notified when dropdowns open and close
   • Aware of the current filter state
   • Informed when filter results update
   • Moved to the first result item when pagination changes

4. Descriptive Labels: All interactive elements have clear, descriptive labels including:

   • Filter category names in selected filters
   • Counts for each filter option
   • Clear instructions for removing filters

Visual Accessibility

Visual enhancements for improved accessibility include:

1. Focus Indicators: All interactive elements have visible focus indicators with sufficient contrast.
2. Loading States: Clear loading indicators show when content is being fetched.
3. Error States: Error messages are clearly displayed when issues occur.
4. Sufficient Contrast: Text and UI elements maintain appropriate contrast ratios.
5. Consistent Design: Interactive elements use consistent design patterns for predictability.

Mobile Accessibility

The filter system is designed to be accessible on mobile devices:

1. Responsive Design: All filter controls adapt to smaller screen sizes.
2. Touch Targets: Buttons and checkboxes have adequate touch target sizes.
3. Simple Interactions: Mobile interactions are simplified for easier use.

Implemented WCAG Guidelines

The filter system aims to meet the following WCAG 2.1 success criteria:

• 1.3.1 Info and Relationships: Information, structure, and relationships are programmatically determined.
• 1.4.3 Contrast: Text and interactive elements have sufficient contrast.
• 2.1.1 Keyboard: All functionality is operable through a keyboard interface.
• 2.4.3 Focus Order: Focus order preserves meaning and operability.
• 2.4.6 Headings and Labels: Headings and labels describe topic or purpose.
• 2.4.7 Focus Visible: Keyboard focus indicator is visible.
• 3.2.1 On Focus: Components do not initiate a change of context on focus.
• 3.2.2 On Input: Changing user interface components does not automatically cause unexpected context changes.
• 3.3.1 Error Identification: Input errors are clearly identified.
• 4.1.2 Name, Role, Value: For all UI components, name and role can be programmatically determined.

Test Instructions

To test the accessibility of the filter system:

1. Keyboard Navigation Test:

   • Tab through all interactive elements
   • Open and close dropdowns using the keyboard
   • Select and unselect filter options
   • Submit search queries
   • Navigate pagination

2. Screen Reader Test:

   • Test with VoiceOver (Mac) or NVDA/JAWS (Windows)
   • Verify that all controls are announced properly
   • Check that state changes are announced
   • Ensure all interactive elements have appropriate roles and labels

3. Mobile Test:

   • Test on various mobile devices
   • Verify touch target sizes are adequate
   • Check that all functions work with touch input

Future Improvements

Areas for future accessibility improvements:

1. Expanded Keyboard Shortcuts: Add more keyboard shortcuts for power users.
2. Enhanced High Contrast Mode: Improve visibility in high contrast mode.
3. Support for Reduced Motion: Add options for users who prefer reduced motion.