codeant-ai-for-open-source[bot] commented on PR #38342:
URL: https://github.com/apache/superset/pull/38342#issuecomment-4055049536
## **Sequence Diagram**
This PR adds global accessibility infrastructure to the app shell, including
document language setup, skip-to-content navigation, and live status
announcements. The diagram shows the main user flow for keyboard bypass and how
dynamic updates are announced to assistive technology.
```mermaid
sequenceDiagram
participant User
participant AppShell
participant SkipLink
participant MainContent
participant StatusAnnouncer
User->>AppShell: Open application page
AppShell->>AppShell: Set page language and mount accessibility providers
User->>SkipLink: Tab to skip link and activate
SkipLink->>MainContent: Focus main content region
MainContent-->>User: Keyboard focus moves past navigation
User->>AppShell: Perform action that changes page status
AppShell->>StatusAnnouncer: Send polite or assertive message
StatusAnnouncer-->>User: Screen reader announces update then clears
message
```
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