css.properties.text-box-edge - Chromium supports cap and ex keywords

[1jj]

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?

Compat table says cap and ex keywords are unsupported by Chrome and Edge.

What browsers does this problem apply to, if applicable?

No response

What did you expect to see?

I'm sure Chromium supports it since the beginning, as I use it in real-world.

Did you test this? If so, how?

Try yourself
https://codepen.io/web-dot-dev/pen/RNbyooE

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

https://developer.chrome.com/blog/css-text-box-trim

Do you have anything more you want to share?

The same for text-box

MDN URL

https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/text-box-edge

MDN metadata

MDN page report details

• Query: css.properties.text-box-edge
• Report started: 2026-03-24T02:39:02.199Z

[caugner]

The collector tests for text-box-edge: cap and text-box-edge: ex fail in Chrome 146 on macOS 26.3.1, because the following statements return false:

CSS.supports('text-box-edge', 'cap')
CSS.supports('text-box-edge', 'ex')

The Codepen uses the text-box shorthand with two text-box-edge values, and the following statements return true:

CSS.supports('text-box', 'trim-both cap alphabetic')
CSS.supports('text-box', 'trim-both ex alphabetic')

Likewise, the following statements return true:

CSS.supports('text-box-edge', 'cap alphabetic')
CSS.supports('text-box-edge', 'ex alphabetic')

The parser for text-box-edge was implemented in chromium/chromium@005cd35 (bug 41494590) and explicitly mentions:

Now we're going to allow the following rule:
leading | [ text | cap | ex ] [ text | alphabetic ]?

However, bug 385160696 mentions that cap and ex alone are invalid, and this explains why the collector tests are failing.

So the collector tests for cap and ex need to be updated to specify the a second value.

[1jj]

Aaah, really confusing.
The only thing I use is the minimized shortcut text-box: cap alphabetic;
(may be because the longhand did not work when I tested)