Newly Available
Selectors
id: open-pseudo
:open
The
:open CSS pseudo-class matches elements that have open states, like <details>, <dialog>, or <select>, based on their state.
Baseline Status:
Achieved Newly Available on May 11, 2026 across core engines.
Desktop Browser Engine Support
Google Chrome
133
Supported
Mozilla Firefox
136
Supported
Apple Safari
26.5
Supported
Microsoft Edge
133
Supported
Mobile Browser Engine Support
Chrome Android
133
Firefox Android
136
Safari iOS
26.5
Specifications and References
MDN Browser Compat Data Keys: