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Alex Francis13,840 Points
Use case of <th> over <td> in rows
I'm wondering whether it is compulsory to use <th> at the start of each row, or if it is generally considered best practice (such as for accessibility reasons), or if it is functionally optional.
Steven Parker216,891 Points
Browsers might happen to render a page that looks like what you expect without it; but in valid HTML code, a <td> element must be a child of a <tr> element.