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- Table headers MUST be designated with <th>.
- Data table header text MUST accurately describe the category of the corresponding data cells.
- Table data cells MUST be associated with their corresponding header cells.
- Table data group headers MUST be associated with their corresponding data cell groups.
- Header/data associations that cannot be designated with <th> and scope MUST be designated with headers plus id
- Data table headers and data associations MUST NOT be referenced across nested, merged, or separate tables.
- Layout tables MUST NOT contain data table markup.
iFrames
- Iframes that convey content to users MUST have a non-empty title attribute.
- The iframe title MUST be accurate and descriptive.
- Frames MUST have a unique title (in the context of the page).
- The source page of an iframe MUST have a valid, meaningful <title>.
Other