The news
Apple released the initial developer betas of iOS 27.3, iPadOS 27.3, and macOS Golden Gate 27.3 on November 3. The updates focus on Safari and introduce a vertical tabs option that replaces the standard horizontal tab bar. The change appears across iPhone, iPad, and Mac, with particular relevance for devices that have more screen width.
Context
Safari has used a horizontal tab bar for years. The new layout moves tabs to the left edge and defaults to icon-only display to limit width. Users can expand the bar to show page titles when needed. The feature integrates with existing Tab Groups and with Topics, which Apple Intelligence can generate automatically when tab sorting is enabled. Adaptive Dark Mode also arrives in the same betas, though details remain limited in the initial announcements.
Details
Vertical tabs sit on the left side of the window or screen. By default the bar shows only site icons. An option widens the column so full titles become visible. The layout supports Topics created by Apple Intelligence and continues to work with manually created Tab Groups. Users can still pin tabs by dragging them into place and can switch between groups with the existing controls.
The vertical option is available on every platform covered by the 27.3 betas. Sources note that the wider iPhone Duo screen makes the layout especially practical on that device, yet the same code path runs on iPad and Mac without additional configuration. Pinning, group switching, and other tab management gestures remain unchanged.
Adaptive Dark Mode is listed alongside the tab changes in the release notes from multiple outlets. One report also mentions new Siri AI Custom Actions that tie into Safari, though the precise actions are not described in the current beta documentation. The updates are scheduled to reach the public in December.
Reactions / counterpoints
Coverage from Daring Fireball, MacRumors, 9to5Mac, and Six Colors all highlight the same core changes without contradiction. No sources report user testing results or performance data from the betas yet. The limited information on Adaptive Dark Mode and Siri AI Custom Actions leaves those features less defined than the vertical tabs implementation.
Why it matters
A left-side tab bar changes how users scan open pages on wider screens. On the iPhone Duo the extra horizontal space makes the layout viable for the first time on a phone. The integration with Apple Intelligence Topics adds an automated layer on top of manual Tab Groups, which may reduce the friction of keeping many tabs organized. Vertical tabs also preserve core gestures such as pinning by drag and quick group switching, so the shift does not require users to relearn basic tab handling.
The move aligns Safari more closely with browser layouts common on desktop operating systems, where vertical tabs have existed for years in competing products. On Apple hardware the change becomes practical only when screen real estate supports it, which explains the emphasis on the iPhone Duo. Adaptive Dark Mode and Siri AI Custom Actions appear in the same release notes, yet their descriptions stay thin. Until fuller documentation or later betas surface, it remains unclear how much those additions will affect daily use.
The December public release will show whether enough users turn on the vertical view to make the redesign a lasting default or merely an optional toggle. For now the betas deliver a concrete layout option backed by existing tab management tools rather than a full overhaul of browsing behavior.
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