css.properties.writing-mode - vertical-* does not work on <th> or <td> on iOS < 17

What type of issue is this?

Incorrect support data (example: BrowserX says "86" but support was added in "40")

What information was incorrect, unhelpful, or incomplete?

In the browser compatibility table it is stated that on Iphones with iOS 9 or higher writing-mode: vertical-* is supported. However on or elements it is only supported from iOS 17 or higher.

What browsers does this problem apply to, if applicable?

Safari

What did you expect to see?

Text on the <th> or <td> to be vertical.

Did you test this? If so, how?

Tested on a iPhone 8 with iOS 16.7.14 with:

<table>
    <thead>
        <tr>
            <th style="writing-mode: vertical-lr">This text should be vertical</th>
        </tr>
    </thead>
</table>

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/writing-mode#browser_compatibility

Do you have anything more you want to share?

According to Gemini. support for writing-mode: vertical-lr on table elements like <th> and <td> was added to Webkit on iOS 17.

MDN URL

https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/writing-mode

MDN metadata

Start by inspecting the css.properties.writing-mode compatibility data and compare its iOS Safari entries with the MDN browser compatibility page and the reported iOS 16 and 17 behavior. Update the affected support data if the claim is confirmed, then run the repository's data validation checks; done means the table distinguishes support for th and td elements accurately.