Incorrect description of percentages in `text-decoration-inset`

[SebastianZ]

MDN URL

https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/154

What specific section or headline is this issue about?

No response

What information was incorrect, unhelpful, or incomplete?

Percentage values in text-decoration-inset do not refer to the font size.

What did you expect to see?

Percentage values either refer to the inline size of the decoration box or the inline size of each box fragment, depending on the value of box-decoration-break.

Do you have any supporting links, references, or citations?

https://drafts.csswg.org/css-text-decor-4/#propdef-text-decoration-inset

Do you have anything more you want to share?

That's also important once percentage values are added to https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/text-decoration-inset.

I've written the spec text. So if there are any questions about that, feel free to ask me.😊

MDN metadata

Page report details

• Folder: en-us/mozilla/firefox/releases/154
• MDN URL: https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Releases/154
• GitHub URL: https://github.com/mdn/content/blob/main/files/en-us/mozilla/firefox/releases/154/index.md
• Last commit: 2ad62b2
• Document last modified: 2026-08-17T20:48:36.000Z

[Radhikarathi04]

@SebastianZ Hi, I'd like to work on this if it's still available. Happy to update both releases/154 and the experimental features page, since the same sentence appears in each.

[Radhikarathi04]

@SebastianZ kindly check PR for fixing the issue - #45261