[css-transitions-2] Explicitly define what is valid/invalid in `@starting-style`
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Description
The spec does not explicitly define what is valid/invalid in its block value. It only says:
Global, name-defining at-rules such as
@keyframes,@font-face, and@layerare allowed inside@starting-style[...]
I guess it accepts any rule that is normally allowed at the top-level of a stylesheet, and not otherwise restricted. It does not accept declarations, which means it can be defined with @starting-style { <rule-list> }.
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 with the CSS Transitions Level 2 defining-before-change-style section linked in the issue, and review its wording around @starting-style and global, name-defining at-rules. Done means the specification explicitly states which block contents are valid or invalid, including whether declarations are accepted.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- css
- Domain
- documentation
- Issue type
- Documentation
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100