Safari beta adds vertical tabs and adaptive dark mode
Apple’s first iOS 27.3, iPadOS 27.3 and macOS Golden Gate 27.3 betas added a vertical-tab layout and Adaptive Dark Mode to Safari. The updates also included Siri AI Custom Actions, according to specialist reports. The features remain in developer testing and may change before their public release.
Why it matters
The redesign gives Safari users more control over dense tab collections while extending dark-mode handling across websites.
Sources
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Part of the November 4, 2026 brief.