Computed value for CSS animation's animation-timeline component
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- Dominant language
- JavaScript
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Description
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: https://github.com/mdn/content/commit/8fbdeb7fdee69284a6423044f24b8b4a7140028f
- Document last modified: 2026-05-11T10:00:10.000Z
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reviewing the referenced MDN page at files/en-us/web/css/reference/properties/animation/index.md and compare its formal-definition entries with the CSS Animations 2 links in the issue. Confirm the intended computed-value wording for animation-timeline and the other shorthand components; done means the relevant data is consistent with the specification.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- css
- Domain
- documentation
- Issue type
- Documentation
- Difficulty
- 2/5
- Estimated time
- 1-3 hours
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 68/100