# Safari Technology Preview 250 Release Notes Learn about the latest web technology updates in Safari Technology Preview: . ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 250 is now [available for download](https://developer.apple.com/safari/resources/) for macOS Golden Gate and macOS Tahoe. 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: [317507@main…317934@main](https://github.com/WebKit/WebKit/compare/b1a790aab65acaee0e7395b20fe98bff3d539ada...41655c489e18c93c2bf0614173c3ac942fbf35fe). ### Accessibility #### Resolved Issues - Fixed VoiceOver reading a stray newline and skipping lines when navigating a `` whose value ends in a line break. ([317784@main](https://commits.webkit.org/317784@main)) (182912872) ### CSS #### New Features - Added support for the `spaces` value of the `ruby-overhang` property, which limits annotation overhang to adjacent spaces and punctuation, with `none` now an alias for `spaces`. ([317569@main](https://commits.webkit.org/317569@main)) (181808420) - Added support for the `content` property on the `::marker` pseudo-element. ([317570@main](https://commits.webkit.org/317570@main)) (182750380) - Added support for the `text-decoration-inset` property. ([317571@main](https://commits.webkit.org/317571@main)) (182750933) - Added support for the `white-space-trim` property. ([317573@main](https://commits.webkit.org/317573@main)) (182751076) - Added support for the `wrap-inside` property. ([317574@main](https://commits.webkit.org/317574@main)) (182751559) #### Resolved Issues - Fixed a `list-style-position: inside` marker glyph being painted one device pixel away from the equivalent inline text. ([317789@main](https://commits.webkit.org/317789@main)) (182447949) - Fixed `text-decoration` specified on `::selection` never being painted. ([317673@main](https://commits.webkit.org/317673@main)) (182757292) - Fixed a text decoration on `::selection` not being painted when the selected text had no decoration of its own. ([317695@main](https://commits.webkit.org/317695@main)) (182864748) - Fixed a `max-content` sized block collapsing to zero width when its child used an orthogonal writing mode. ([317781@main](https://commits.webkit.org/317781@main)) (183026896) #### Deprecations - Removed support for the non-standard `text` color value; use `canvastext` instead. ([317687@main](https://commits.webkit.org/317687@main)) (100364547) ### Editing #### New Features - Added support for copying and pasting `image/svg+xml` data with the Clipboard API, sanitizing the markup on both read and write. ([317528@main](https://commits.webkit.org/317528@main)) (137553836) ### JavaScript #### New Features - Added support for the Explicit Resource Management proposal, including `using` and `await using` declarations, `Symbol.dispose`, `DisposableStack`, and `AsyncDisposableStack`. ([317894@main](https://commits.webkit.org/317894@main)) (103209363) - Added support for `Iterator.zip()` and `Iterator.zipKeyed()` from the Joint Iteration proposal. ([317886@main](https://commits.webkit.org/317886@main)) (180967133) - Added JavaScript and WebAssembly feature flags alongside other web feature settings. (317306@main (https://commits.webkit.org/317306@main)) (182210113) ### Media #### Resolved Issues - Fixed a spurious `pause` and `ended` event firing on a live HLS stream when playback reached the live edge. ([317626@main](https://commits.webkit.org/317626@main)) (100556746) - Fixed a media fragment with an out-of-range hours value being accepted as a valid seek instead of being rejected. ([317869@main](https://commits.webkit.org/317869@main)) (181820705) - Fixed a WebVTT cue incorrectly inheriting a preceding line as its identifier across a `REGION` or `STYLE` block. ([317811@main](https://commits.webkit.org/317811@main)) (181977285) ### Networking #### New Features - Added initial support for uploading a `ReadableStream` body with `fetch()`. ([317724@main](https://commits.webkit.org/317724@main)) (182510365) - Added support for the `duplex` option on `Request`, which is required when uploading a `ReadableStream` body. ([317768@main](https://commits.webkit.org/317768@main)) (182802330) ### Scrolling #### Resolved Issues - Fixed `scrollIntoView()` on an inline element sharing a line with a much taller element scrolling to the top of the line box instead of to the element. ([317933@main](https://commits.webkit.org/317933@main)) (178491868) - Fixed paged scrolling with Page Down or the spacebar skipping over intermediate scroll snap points. ([317562@main](https://commits.webkit.org/317562@main)) (182562852) - Fixed a crash that could occur while sending a scroll update during window tear-down. ([317785@main](https://commits.webkit.org/317785@main)) (182972245) - Fixed re-snapping after layout always preferring a focused element, instead of only when focus has changed. ([317892@main](https://commits.webkit.org/317892@main)) (183146768) ### Storage #### Resolved Issues - Fixed an IndexedDB `put()` that fails a unique index constraint deleting the record it would have overwritten, leaving the object store with neither the old nor the new record. ([317632@main](https://commits.webkit.org/317632@main)) (181513905) ### Web API #### Resolved Issues - Fixed Digital Credentials `get()` being rejected in an iframe inside a focused window. ([317656@main](https://commits.webkit.org/317656@main)) (109191868) ### Web Inspector #### New Features - Added support for showing WebAssembly modules in the Sources tab. ([317891@main](https://commits.webkit.org/317891@main)) (182605814) #### Resolved Issues - Fixed disabling the resource cache overwriting a `Cache-Control` header already set by the page. ([317814@main](https://commits.webkit.org/317814@main)) (183072123) ### WebAssembly #### New Features - Added support for relaxed SIMD instructions. ([317549@main](https://commits.webkit.org/317549@main)) (180967232) - Added support for multiple memories in a single WebAssembly module. ([317636@main](https://commits.webkit.org/317636@main)) (182219080) ### WebDriver #### New Features - Added support for the “consume user activation” extension command, which consumes the current browsing context’s transient user activation and reports whether it was present. ([317715@main](https://commits.webkit.org/317715@main)) (102634281) --- Copyright © 2026 Apple Inc. 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