Snackbar: Accessibility

[acdvorak]

In scope

• Announce label text to screen reader users
  • Use a "polite" live region to avoid interrupting the user's work
• Hide from accessibility tree while closed
  • Determine whether to use display: none or aria-hidden="true"
• Prevent focus while closed
• Dedicated "X" icon to dismiss
  If a snackbar gets "stuck", the user needs a way to manually dismiss it. See Snackbar action handler text not appearing #3981.

Out of scope

• Indefinite timeouts
• Disabling timeouts for assistive technology users (not possible on the Web)
• Exposing action buttons to assistive technology users
  • See ARIA role="alert" documentation and WCAG 2.0 — SC 2.2.3 — No Timing
• Focus management
  • See ARIA role="alert" best practices for rationale
• Keyboard shortcuts (mnemonics) to focus or dismiss the snackbar
• Gestures (e.g., swipe down to dismiss)