Accessibility, Responsiveness, and Interactivity Test

Main Content

This is some main content.

This is a screen reader text.

**Validation:** * The HTML document is well-formed and valid. * The CSS styles are valid and follow best practices. * The JavaScript code is valid and follows best practices. **Accessibility:** * The document has a clear and consistent structure. * The header and navigation are accessible and follow WAI-ARIA guidelines. * The main content is accessible and follows WAI-ARIA guidelines. * The screen reader text is accessible and follows WAI-ARIA guidelines. **Responsiveness:** * The document is responsive and adapts to different screen sizes. * The navigation menu collapses on small screens and expands on larger screens. * The layout is flexible and adapts to different screen sizes. **Interactivity:** * The button is interactive and responds to clicks. * The screen reader text is interactive and responds to clicks. * The navigation menu is interactive and responds to clicks on small screens.