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Web Platform Baseline Status Breakdown Total Features: 1219
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2026

2 features
• May 2026
Newly Available

The :open CSS pseudo-class matches elements that have open states, like <details>, <dialog>, or <select>, based on their state.

Chrome 133
Firefox 136
Safari 26.5
Edge 133
Baseline Date: May 11, 2026
• January 2026

The :active-view-transition CSS pseudo-class matches the root element when a view transition is active. The :active-view-transition-type() CSS pseudo-class matches only when the active view transition was started with the specified type.

Chrome 125
Firefox 147
Safari 18.2
Edge 125
Baseline Date: Jan 13, 2026