The following meet WCAG 2.0 AA standards for both legal and best practices.
Page titles
Required
- 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.
Non-required / best practice
- If a page is the result of a user action or scripted change of context, the text of the <title> SHOULD describe the result or change of context to the user.
- The <title> SHOULD be concise.
- The page <title> SHOULD be unique, if possible.
- Unique information SHOULD come first in the <title>.
- The page <title> SHOULD match (or be very similar to) the top heading in the main content.
Language
Required
- 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.
Non-required / best practice
Headings
Required
- Headings MUST be accurate and informative.
Non-required / best practice
- Text that acts as a heading visually or structurally SHOULD be designated as a true heading in the markup.
- Text that does not act as a heading visually or structurally SHOULD NOT be marked as a heading.
- Heading text SHOULD be concise and relatively brief.
- Headings SHOULD convey a clear and accurate structural outline of the sections of content of a web page.
- Headings SHOULD NOT skip hierarchical levels.
- The beginning of the main content SHOULD start with <h1>.
- Most web pages SHOULD have only one <h1>.