Specify the <th> element each header cell is related to:
The headers attribute has no visual effect in ordinary web browsers, but can be used by screen readers.
The headers attribute specifies one or more header cells a header cell is related to.
The headers attribute is new for the <th> tag in HTML5.
|header_id||Specifies a space-separated list of id's to one or more header cells the header cell is related to|
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