Page titles
- The page <title> MUST be present and MUST contain text.
- The page <title> MUST be updated when the web address changes.
- The page <title> MUST be accurate and informative.
Language
- The primary language of the page MUST be identified accurately on the <html> element.
- The primary language of the page MUST be identified with a valid value on the <html> element.
- Inline language changes MUST be identified with a valid lang attribute.
- The language code MUST be valid.
Headings
- Headings MUST be accurate and informative.