23.3.2 Identifying row and column groups and header cells
§23.3.2.1 Using browser-dependent HTML tags for tables
§23.3.2.2 Designating table header cells
§23.3.2.3 Enumerating table column groups
§23.3.2.4 Wrapping table row groups
§23.3.2.5 Overriding row and column group settings
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