` soup. WCAG 1.3.1 (Level A) requires that information, structure, and relationships conveyed visually are also available programmatically — which in practice means using the right element.
## How to implement
A typical page skeleton:
```html
Skip to main content
Page title
…
Section heading
…
```
Key rules:
- **Exactly one `
` per page.** Two mains break the landmark list.
- **Name every duplicate landmark** with `aria-label` or `aria-labelledby`. A page with two `