# Safari 27.1 Release Notes Released October 23, 2026 — 27.1 (20625.1.29) ## Overview Safari 27.1 is available for iOS 27.1. ### PDF #### New Features - Added support for automatically showing PDFs as two pages side by side when a foldable device is partially folded into a book pose, and switching back to a single page when the device is unfolded. (170353889) ### Web API #### New Features - Added support for the Device Posture API behind a feature flag, so websites can respond when a device is folded. `navigator.devicePosture.type` returns `continuous` or `folded`, and the `change` event fires on `navigator.devicePosture` when the posture changes. The `device-posture` media query matches `continuous` or `folded`. Note that without a document, `navigator.devicePosture.type` defaults to `continuous`. (170005463) - Added support for the Viewport Segments API behind a feature flag, so websites can lay out content around a fold between the separate areas of the screen. The `horizontal-viewport-segments` and `vertical-viewport-segments` media queries match the number of segments. The `env()` variables `viewport-segment-width`, `viewport-segment-height`, `viewport-segment-top`, `viewport-segment-right`, `viewport-segment-bottom`, and `viewport-segment-left` take horizontal and vertical index arguments to return the dimensions and position of each segment. (176426722) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)