App Interface Guideline: Accessibility — Dynamic Updates. Keywords: accessibilityLiveRegion announce. Platform: iOS/Android/React Native. Description: Async status updates should be announced to screen readers. Do: Use accessibilityLiveRegion or announceForAccessibility. Don't: Update text silently with no announcement. Good Example: <Text accessibilityLiveRegion="polite">{status}</Text>. Bad Example: <Text>{status}</Text>. Severity: Medium.