# Safari Technology Preview 206 Release Notes Learn about the latest web technology updates in Safari Technology Preview: CSS, Editing, JavaScript, Media, Rendering, SVG, Tables, Web Extensions,WebDriver, and WebRTC. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 206 is now [available for download](https://developer.apple.com/safari/resources/) for macOS Sequoia beta and macOS Sonoma. If you already have Safari Technology Preview installed, you can update it in System Settings under General → Software Update. This release includes WebKit changes between: [284050@main…284743@main](https://github.com/WebKit/WebKit/compare/de71d4602041131133097d9fe6dcf91c55a3a298...e7b4f98ae25b959bbb9c69f0cf14540794868a55). ### CSS #### Resolved Issues - Fixed: Dropped layout containment from `container-type`. ([284730@main](https://commits.webkit.org/284730@main)) (132549134) - Fixed CSS nested declarations inside a `@scope` to behave like `:where(:scope)`. ([284635@main](https://commits.webkit.org/284635@main)) (136856371) ### Editing #### New Features - Implemented `ClipboardItem.support()` which gives the page author the ability to understand which formats are [supported during Clipboard operations](https://w3c.github.io/clipboard-apis/#dom-clipboarditem-supports). It also now returns a TypeError for a new `ClipboardItem()` with an empty Array. ([284593@main](https://commits.webkit.org/284593@main)) (136008522) #### Resolved Issues - Fixed missing `SecureContext` in the `ClipboardItem` interface. ([284511@main](https://commits.webkit.org/284511@main)) (137197266) ### JavaScript #### New Features - Completed the [Iterator Helpers proposal](https://github.com/tc39/proposal-iterator-helpers) by implementing `map()`, `filter()`, `take()`, `drop()`, and `flatMap()` methods. ([284597@main](https://commits.webkit.org/284597@main)) (103171739) #### Resolved Issues - Fixed `Iterator.prototype.reduce()` not properly forwarding the `return()` call to the underlying iterator. ([284648@main](https://commits.webkit.org/284648@main)) (137181340) ### Media #### New Features - Added support for the [Image Capture API](https://w3c.github.io/mediacapture-image/#imagecaptureapi). ([284447@main](https://commits.webkit.org/284447@main)) (136860809) ### Rendering #### Resolved Issues - Fixed non-separable blend modes in `mix-blend-mode` to workon elements in compositing layers. ([284170@main](https://commits.webkit.org/284170@main)) (49387130) - Fixed repeating `background-image` sized to the `content-box` failing to fill the viewport in an iframe. ([284165@main](https://commits.webkit.org/284165@main)) (133952319) - Fixed floats not clearing in the WordPress Classic Editor sidebar layout. ([284247@main](https://commits.webkit.org/284247@main)) (136362683) ### SVG #### Resolved Issues - Fixed: Updated `getTotalLength()` with the web specification to throw an exception when non-renderable and the path is empty. ([284311@main](https://commits.webkit.org/284311@main)) (136719548) ### Tables #### Resolved Issues - Fixed Table Root to also account for `fill-available` in a fixed table layout. ([284712@main](https://commits.webkit.org/284712@main)) (137297914) ### Web Extensions #### New Features - Added support for `getKeys()` in storage areas. ([284602@main](https://commits.webkit.org/284602@main)) (136595295) - Added support for `i18n.getSystemUILanguage` and `i18n.getPreferredSystemLanguages`. ([284637@main](https://commits.webkit.org/284637@main)) (136929657) ### WebDriver #### Resolved Issues - Fixed a crash that could occur when simulating drag events with the right mouse button. ([284577@main](https://commits.webkit.org/284577@main)) (137068514) ### WebRTC #### New Features - Added support for enumerated visible network interfaces. ([284687@main](https://commits.webkit.org/284687@main)) (137067672) #### Resolved Issues - Fixed `MediaSession.setMicrophoneActive(true)` prompting repeatedly if the microphone was muted by the user-agent once. ([284399@main](https://commits.webkit.org/284399@main)) (135941062) - Fixed` setCameraActive` to not unmute microphone if the user-agent previously muted both camera and microphone. ([284069@main](https://commits.webkit.org/284069@main)) (136221456) - Fixed AirPods unmuting to not unmute the camera if website muted the camera. ([284514@main](https://commits.webkit.org/284514@main)) (137065964) --- 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)