The parsing of :where and :is is not spec compliant
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- Dominant language
- Python
- Stars
- 310
- Forks
- 70
- Avg merge
- 2h 9m
- Merged PRs (30d)
- 4
Description
The parsing for :is and :where currently implements parsing a list of compound selectors while CSS supports any selector lists, i.e. lists of complex selectors.
Side note: the naming is confusing in this package as it uses the name "simple selector" to actually represent what is called "compound selector" in the CSS spec: https://www.w3.org/TR/selectors-4/#structure
Contributor guide
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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 locating the parser implementation for :is and :where, then compare its compound-selector handling with the Selectors Level 4 structure specification linked in the issue. Done means both pseudo-classes accept lists of complex selectors rather than only lists of compound selectors, with coverage for the corrected parsing behavior.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- web-dev
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100