Gets or sets a value to indicate whether to add a TableHeaderCell.Scope attribute when the control is rendered as a System.Web.UI.WebControls.Table.
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If true and the control is rendered as a System.Web.UI.WebControls.Table, a "scope" attribute with value "col" is added and a table header cell (<th>) is rendered instead of a table cell (<td>) for the header cells when the System.Web.UI.WebControls.Table is rendered. This attribute can be used by screen readers.