- Format: Support nested lists. E.g., HTML
    ullists.
- Help author: Encode table of contents using nested ulelements (e.g., not just using different font sizes and indentation).
- Authoring tool: Generate proper structured markup, provide an accessible
    UI and documentation.
- Help viewer: Display nested structure visually, communicate with
    assistive technologies (e.g., through the DOM and Microsoft Active
    Accessibility (MSAA) to allow specialized
  rendering.
In documentation, explain how end users can promote accessibility (e.g.,
how to use an authoring tool to create accessible content).