Apple releases first developer beta of macOS 27.3

Nov 4

1. 22:39

   MacRumors Apple Intelligence

   macOS 27.3 makes Markdown files easier to read

   macOS 27.3 adds native Markdown rendering to Quick Look, so previewing .md files displays formatting such as headings, bold text, lists, and links, with no need for an extra editor or Quick Look extension. The feature is available in the first developer beta of macOS 27.3 released yesterday, continuing the path set by Markdown import and export in Notes on iOS 26 and Markdown copy and paste support in iOS 27; Apple's Siri AI app skills also use SKILL.md files.

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2. 07:11

   9to5Mac

   macOS 27.3 adds native Markdown rendering to Quick Look

   Starting with macOS 27.3 beta 1, Quick Look can render .md files directly in their formatted form instead of displaying raw Markdown syntax. This version also brings Safari vertical tabs and adaptive dark mode, expanded Siri AI capabilities, and new tools for third-party developers; Apple's new Siri AI skills framework also uses Markdown-based SKILL.md files.

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3. 03:37

   Sina Tech

   Apple releases first developer preview of macOS 27.3: Siri AI expected to expand support for Traditional Chinese

   Apple has released the first developer beta of macOS 27.3 Golden Gate, with internal build number 26C5035r, only about a week after the release of macOS 27.2. 9to5Mac reports that the main highlight of this update is expanded Siri AI language support, possibly adding Traditional Chinese, Norwegian, Turkish, and Vietnamese, but this information still awaits verification, and the related language support may go live with the official release in December. On the same day, Apple Intelligence in mainland China unlocked its first batch of skills through the first developer preview of iOS 27.3, initially available only on iPhone.

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4. 02:51

   9to5Mac

   iOS 27.3 and macOS 27.3 add vertical tabs, adaptive dark mode, and Siri AI actions to Safari

   Apple released the first developer betas of iOS 27.3, iPadOS 27.3, and macOS 27.3, adding a vertical tab layout, adaptive dark mode, and Siri AI tab actions to Safari. Vertical tabs are arranged as icons on the left by default and can be resized in width to show website titles; adaptive dark mode can automatically generate dark versions for websites that do not support dark mode. Siri can now directly move, sort, organize, and close tabs, and these updates are expected to roll out to all users in December.

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5. 02:51

   MacRumors Apple Intelligence

   iOS 27.3 Brings Vertical Tabs and Adaptive Dark Mode to Safari

   iOS 27.3, iPadOS 27.3, and macOS Golden Gate 27.3 add a vertical tab layout and adaptive dark mode to Safari. The former is located on the left side of the screen and displays icons by default, and can be used with Topics and Tab Groups. Adaptive dark mode generates dark versions for websites that lack a native dark design, and can be enabled globally or per site. Siri gains the ability to manage tabs and windows and to clear history by site and time period, while web content understanding will be introduced later. The developer beta is now available, and the official release will arrive this December.

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6. 02:29

   9to5Mac

   Apple Releases First RC of macOS Sequoia 15.8.3 and macOS Tahoe 26.7.3

   Apple has released the first release candidates of macOS Sequoia 15.8.3 and macOS Tahoe 26.7.3, with build numbers 24H314 and 25G416, respectively. The release notes for both RCs only state that they "provide security fixes for Mac," and specific vulnerability details are expected to be disclosed after the official release. Last week's releases of macOS Sequoia 15.8.2 and macOS Tahoe 26.7.2 fixed more than 150 security vulnerabilities.

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7. 02:12

   9to5Mac

   watchOS 27.3, iPadOS 27.3 and other developer beta 1 releases

   Apple has pushed beta 1 of watchOS 27.3, iPadOS 27.3, tvOS 27.3 and other systems to developers. watchOS 27.3 is expected to add Audio Intelligence features such as Siri Recap and Live Rewind to compatible watch models, and the all-new Health app is also expected to return in iOS/iPadOS 27.3. The public beta is not yet available.

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8. 02:10

   9to5Mac

   First developer beta of macOS 27.3 Golden Gate released

   Apple has released the first developer beta of macOS 27.3 Golden Gate, build number 26C5035r, which may add Siri AI language support for Traditional Chinese, Norwegian, Turkish, Vietnamese, and more. This version may continue optimizing the macOS interface for touch input, building on the gesture recognition tools introduced in macOS 27.2. When Apple Intelligence enters China with iOS 27.3, it will initially be limited to iPhone, with other platforms awaiting regulatory approval.

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