w3c / w3c/csswg-drafts

[selectors] Adding infinity loop pseudo-classes and :contains() to the snapshot profile

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Description

I suggest to restore the snapshot profile and add there :contains() and pseudo-classes which may cause infinity loops if detecting them really requires significant changes in browser architectures and is problematic (it is better to ask browser developers how it is for now).

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reviewing the issue's proposal to restore the snapshot profile and add :contains() plus pseudo-classes that may cause infinite loops. Check the CSS Working Group's current snapshot-profile material and selector discussions; done would require an agreed scope and documented treatment for these selectors.

Written by the indexing model from the issue text.

Assessment

Tech stack
css
Domain
frontend
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
20/100

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