こんにちは TAG-さん!

I'm requesting a TAG review of CSS :open pseudo-class.

This pseudo-class applies to HTML elements which have an "open" state. For <details>, this is when the element is expanded. For <dialog>, this is when the element is showing. For <select>, this is when the picker is showing.

• Explainer¹: none
• Specification: https://drafts.csswg.org/selectors-4/#open-state
• WPT Tests: https://wpt.fyi/results/css/selectors/open-closed-pseudo.html
• User research: none
• Security and Privacy self-review²:
• GitHub repo: https://github.com/w3c/csswg-drafts/
• Primary contacts:
  • Joey Arhar @josepharhar Google
• Organization/project driving the specification: Google
• Multi-stakeholder support³:
  • Chromium comments: yes
  • Mozilla comments: https://github.com/mozilla/standards-positions/issues/1085
  • WebKit comments: https://github.com/WebKit/standards-positions/issues/413
• Status/issue trackers for implementations⁴: https://chromestatus.com/feature/5085419215781888

Further details:

• I have reviewed the TAG's Web Platform Design Principles
• Relevant time constraints or deadlines:
• The group where the work on this specification is currently being done: CSSWG
• The group where standardization of this work is intended to be done (if different from the current group):
• Major unresolved issues with or opposition to this specification: https://github.com/w3c/csswg-drafts/issues/11039
• This work is being funded by: Google