Computed value for CSS animation's animation-timeline component

[estelle]

MDN URL

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

What specific section or headline is this issue about?

No response

What information was incorrect, unhelpful, or incomplete?

The computed value for animation-timeline in the formal definition for animation is different than for other props. Every property is a list. They all say "as specified". Only animation-timeline is different. It should be a list of the default value auto until browsers support it, then it should be a "as specified". Possibly, all should be a list as specified.

What did you expect to see?

consistency among all the props

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

https://drafts.csswg.org/css-animations-2/#animation-shorthand
https://drafts.csswg.org/css-animations-2/#animation-timeline

Do you have anything more you want to share?

No response

MDN metadata

Page report details

• Folder: en-us/web/css/reference/properties/animation
• MDN URL: https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Properties/animation
• GitHub URL: https://github.com/mdn/content/blob/main/files/en-us/web/css/reference/properties/animation/index.md
• Last commit: mdn/content@8fbdeb7
• Document last modified: 2026-05-11T10:00:10.000Z

[Josh-Cena]

Please send formal syntax and formal definition issues to mdn/data because the issue is not actionable in this repo