🏠 New in Low Baseline Support: :open
May 11, 2026
The :open CSS pseudo-class matches elements that have open states, like <details>, <dialog>, or <select>, based on their state.
Source features
css.selectors.open[mdn]
May 11, 2026
The :open CSS pseudo-class matches elements that have open states, like <details>, <dialog>, or <select>, based on their state.
css.selectors.open [mdn]