Safari has traditionally supported the latest three major macOS versions. For example, Safari 26 supports macOS 26 Tahoe, macOS 15 Sequoia, and macOS 14 Sonoma. Currently, the Safari 27 beta is available only for the macOS 27 Golden Gate developer beta, but the release notes indicate that the Safari 27 beta will also become available for Tahoe and Sequoia soon, perhaps along with the macOS 27 public beta: “Safari 27 beta is available for iOS 27 beta, iPadOS 27 beta, visionOS 27 beta, macOS 27 beta, macOS 26, and macOS Sequoia.” In contrast, Safari Technology Preview has traditionally supported only the latest two major macOS versions, for some strange reason. The downloads page provides installers for macOS 27 and macOS 26, and the WebKit announcement of the Safari 27 beta said, “You can also install Safari Technology Preview for macOS 27 beta and macOS 26.” That announcement wasn’t entirely accurate, however. On the same day, the WebKit announcement of Safari Technology Preview 245…
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