Bad value X for attribute “dir” on element “table”.

The dir attribute on <table> only accepts ltr, rtl or auto, so a value such as none is invalid.

dir sets the base direction of the table. It affects the text inside each cell and also the column order: with rtl the first column sits on the right edge of the table, with ltr on the left. auto lets the browser pick the direction from the first strongly directional character in the content.

HTML has no keyword that switches direction off. A table without dir inherits the direction of its parent, usually set on the <html> element, which is probably what none was meant to do. Remove the attribute, or set ltr or rtl when the table needs a different direction from the rest of the page. An empty dir="" is invalid for the same reason.

Invalid example

<table dir="none">
  <tr>
    <th>Size</th>
    <th>Price</th>
  </tr>
  <tr>
    <td>Small</td>
    <td>4.50</td>
  </tr>
</table>

Valid example

<table>
  <tr>
    <th>Size</th>
    <th>Price</th>
  </tr>
  <tr>
    <td>Small</td>
    <td>4.50</td>
  </tr>
</table>

Learn more:

MDN Reference

dir - MDN Web Docs

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W3C Reference

W3C - Structural markup and right-to-left text

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