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WCAG: Best Practice: Scope attribute should be used correctly on tables
scopeattribute must be used correctly on tables in accordance with either HTML4 or HTML5 specifications to enable efficient table navigation for screen reader users.
scopeattribute makes table navigation much easier for screen reader users, provided that it is used correctly. Incorrectly used,
scopecan make table navigation much harder and less efficient.
A screen reader operates under the assumption that a table has a header and that this header specifies a scope. Because of the way screen readers function, having an accurate header makes viewing a table far more accessible and more efficient for people who use the device.