# Safari Technology Preview 235 Release Notes Learn about the latest web technology updates in Safari Technology Preview: CSS, Canvas, Clipboard, Editing, Encoding, Forms, HTML, JavaScript, MathML, Media, Networking, Rendering, SVG, Web API, Web Inspector, Web Assembly, and WebRTC. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 235 is now [available for download](https://developer.apple.com/safari/resources/) for macOS Tahoe and macOS Sequoia. 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: [304072@main…305083@main](https://github.com/WebKit/WebKit/compare/aafd2ae784188062f91a671e378556ea14a2d7d9...9ac33ef78924d5f0c356587123825ba1c05097b1). ### CSS #### New Features - Added support for parsing and evaluating name-only `@container` queries that have no conditions, allowing named containers to match without explicit constraints. ([304388@main](https://commits.webkit.org/304388@main)) (164648718) - Added support for `math-depth`. ([305010@main](https://commits.webkit.org/305010@main)) (167332590) #### Resolved Issues - Fixed an issue where `display: list-item` was incorrectly supported on `fieldset`. ([304102@main](https://commits.webkit.org/304102@main)) (95638460) - Fixed baseline handling for table cells when cell has no inflow children. ([304477@main](https://commits.webkit.org/304477@main)) (160774504) - Fixed `-webkit-line-clamp` so that it no longer propagates into `inline-block` children. ([304956@main](https://commits.webkit.org/304956@main)) (164488778) - Fixed an issue where nested identical CSS `filter` effects were not rendered. ([304143@main](https://commits.webkit.org/304143@main)) (165163823) - Fixed `::first-line` pseudo-element to always use `inline` display to match the CSS Display specification. ([304096@main](https://commits.webkit.org/304096@main)) (166068698) - Fixed incorrect text selection ranges for truncated right-to-left content. ([304821@main](https://commits.webkit.org/304821@main)) (166944754) #### Deprecations - Removed the `FontFaceSet` constructor from the CSS Font Loading API as it was deemed unnecessary, aligning with the CSSWG resolution. ([304912@main](https://commits.webkit.org/304912@main)) (132031306) ### Canvas #### Resolved Issues - Fixed `ImageBitmap` created from SVG image sources to correctly honor the `flipY` orientation. ([304137@main](https://commits.webkit.org/304137@main)) (83959718) ### Clipboard #### Resolved Issues - Fixed an issue where using the “Copy Image” context menu in Safari would also copy the image URL, causing some sites to paste the URL instead of the image. ([304166@main](https://commits.webkit.org/304166@main)) (76598990) ### Editing #### Resolved Issues - Fixed incorrect text selection when dragging across pseudo elements. ([304719@main](https://commits.webkit.org/304719@main)) (142905243) - Fixed an issue where focusing a hidden editable element would incorrectly display the text cursor and selection at full opacity. ([304160@main](https://commits.webkit.org/304160@main)) (165489471) ### Encoding #### Resolved Issues - Fixed incorrect handling of invalid UTF-8 sequences in the `TextDecoder` streaming decoder to properly manage partial sequence buffers. ([304496@main](https://commits.webkit.org/304496@main)) (166583808) ### Forms #### Resolved Issues - Fixed an issue where input fields did not display user input while typing . ([304311@main](https://commits.webkit.org/304311@main)) (163613957) ### HTML #### Resolved Issues - Fixed `HTMLImageElement.currentSrc` to return an empty string for `` instead of resolving to the document base URL. ([304982@main](https://commits.webkit.org/304982@main)) (167229274) ### JavaScript #### Resolved Issues - Fixed `%TypedArray%.prototype.includes` to correctly check that the `index` is less than the array length, aligning its behavior with ECMA-262 ([304485@main](https://commits.webkit.org/304485@main)). (166578170) - Fixed `%TypedArray%.prototype.includes` to correctly check that the `index` is less than the array length, aligning its behavior with ECMA-262. ([304940@main](https://commits.webkit.org/304940@main)) (167183441) ### MathML #### New Features - Added support for CSS size containment in MathML elements using `contain-intrinsic-inline-size` and `contain-intrinsic-block-size`. ([304458@main](https://commits.webkit.org/304458@main)) (166323213) - Added support for `math-style` and `math-shift` to animate as discrete values. ([305017@main](https://commits.webkit.org/305017@main)) (167369164) #### Resolved Issues - Fixed incorrect positioning of `mpadded` content in right-to-left mode. ([304087@main](https://commits.webkit.org/304087@main)) (166045517) - Fixed an issue where `RenderMathMLRoot` did not reset its radical operator when `msqrt` or `mroot` children were dynamically added or removed.([304822@main](https://commits.webkit.org/304822@main)) (166556627) - Fixed `` so that percentage values for `width`, `height`, and `depth` attributes are treated as absent and use content dimensions as defaults, matching the MathML Core specification. ([305027@main](https://commits.webkit.org/305027@main)) (167350169) ### Media #### Resolved Issues - Fixed an issue where changing an `HTMLMediaElement` volume from `0` to `0` did not activate the audio session or update the sleep disabler. ([304297@main](https://commits.webkit.org/304297@main)) (161691743) - Fixed playback of `application/ogg` blob media. ([304530@main](https://commits.webkit.org/304530@main)) (163119790) - Fixed an issue where `HTMLMediaElement` did not correctly detect new audio or video tracks causing Safari to pause video when leaving a tab. ([304336@main](https://commits.webkit.org/304336@main)) (164514685) - Fixed a crash in `AudioData.copyTo()` when copying the last channel of 3-channel audio. ([304728@main](https://commits.webkit.org/304728@main)) (164730320) - Fixed the caption menu’s `On` option to correctly enable the highest-scoring text track and mark the appropriate language as checked in the subtitle menu. ([304462@main](https://commits.webkit.org/304462@main)) (166158394) - Fixed `parseSequenceHeaderOBU` to return an `AV1CodecConfigurationRecord`, fully decode the Sequence Header OBU, and capture the complete color profile. ([304474@main](https://commits.webkit.org/304474@main)) (166439682) ### Networking #### Resolved Issues - Fixed a regression where `fetch()` would throw a `TypeError` when using `targetAddressSpace: 'loopback'` for localhost requests. ([304577@main](https://commits.webkit.org/304577@main)) (166574523) ### Rendering #### Resolved Issues - Fixed an issue where overconstrained sticky elements were not properly adjusting their insets when the sticky box rectangle was larger than the viewport. ([304335@main](https://commits.webkit.org/304335@main)) (163654023) - Fixed inconsistent text layout when using `list-style-type` by ensuring outside list markers do not affect intrinsic width calculations. ([304947@main](https://commits.webkit.org/304947@main)) (164650313) - Fixed incorrect min and max width calculations for block-level boxes inside inline content. ([304170@main](https://commits.webkit.org/304170@main)) (166157696) - Fixed an issue where `getClientRects` returned an incomplete list of rectangles for inline boxes containing block elements. ([304949@main](https://commits.webkit.org/304949@main)) (167209147) ### SVG #### New Features - Added support for the `lighter` operator in `SVGFECompositeElement` IDL to align with the Compositing and Blending specification. ([304941@main](https://commits.webkit.org/304941@main)) (166704079) #### Resolved Issues - Fixed an issue where `stroke-dasharray` incorrectly propagated to SVG markers when explicitly marked as ‘0’. ([305042@main](https://commits.webkit.org/305042@main)) (46607685) - Fixed an issue where `foreignObject` elements in SVG incorrectly allowed margin collapsing. ([304916@main](https://commits.webkit.org/304916@main)) (97208795) - Fixed an issue where dynamically changing `marker-start`, `marker-mid`, or `marker-end` attributes on SVG elements did not trigger re-rendering. ([304880@main](https://commits.webkit.org/304880@main)) (130678384) - Fixed tiling gaps in CSS reference filters using ``. ([304830@main](https://commits.webkit.org/304830@main)) (135448018) - Fixed behavior to avoid incorrect pruning of SVG mask subtrees based on visibility. ([305047@main](https://commits.webkit.org/305047@main)) (157729389) - Fixed an issue where SVG `animateTransform` animations on hidden elements were triggering full-page rendering updates each frame. ([304744@main](https://commits.webkit.org/304744@main)) (159647563) - Fixed `SVGLength` percentage resolution for elements inside non-instanced `` elements. ([304197@main](https://commits.webkit.org/304197@main)) (165431008) - Fixed an issue where `SVGLength.value` did not update for font-relative units (e.g., `ch`, `em`) after changes to `writing-mode`. ([304657@main](https://commits.webkit.org/304657@main)) (166190252) - Fixed missing gradient fills when using paint-order `stroke fill`. ([288788@main](https://commits.webkit.org/288788@main)) (166997630) - Fixed embedded `` without an explicit `viewBox` to synthesize `preserveAspectRatio='none'` so the SVG stretches to fill the container. ([305043@main](https://commits.webkit.org/305043@main)) (167121931) - Fixed the `` element `offset` attribute in SVG to reject invalid values with trailing characters and correctly fall back to `0`. ([305036@main](https://commits.webkit.org/305036@main)) (167356988) - Fixed the transform order for `clipPath` elements so that the bounding box is scaled correctly before applying the local transform. ([305078@main](https://commits.webkit.org/305078@main)) (167417135) - Fixed incorrect rendering when combining `markerUnits=strokeWidth` with `vector-effect=non-scaling-stroke`. ([305077@main](https://commits.webkit.org/305077@main)) (167493417) ### Web API #### New Features - Added support for pointer event and mouse event button support for the back and forward mouse buttons when they are available. ([304761@main](https://commits.webkit.org/304761@main)) (137592588) #### Resolved Issues - Fixed an issue where `IntersectionObserver` computed the root rectangle incorrectly when overflow clipping was present. ([304296@main](https://commits.webkit.org/304296@main)) (117143395) - Fixed `DigitalCredential` behavior to make user mediation implicitly required. ([304676@main](https://commits.webkit.org/304676@main)) (165597827) - Fixed an issue where the Big5 `TextDecoder` failed to recover and emit ASCII characters after encountering an invalid leading byte. ([304591@main](https://commits.webkit.org/304591@main)) (166672674) ### Web Inspector #### New Features - Added a context menu option to DOM nodes in the Elements Tab to copy pretty-printed HTML. ([304698@main](https://commits.webkit.org/304698@main)) (102125455) - Added support for toggling the visibility of User Agent stylesheet rules in the Elements tab, including hiding related “go-to” arrows in the Computed panel when the setting is disabled. ([304627@main](https://commits.webkit.org/304627@main)) (164265183) - Added support for showing actual composited layer snapshots in the 3D Layers view. ([304758@main](https://commits.webkit.org/304758@main)) (164977594) - Added support for Web Inspector to fetch CSS property keyword completions based on feature support. ([304195@main](https://commits.webkit.org/304195@main)) (165914089) - Added support for displaying `Order Numbers` in CSS Grid and CSS Grid Lanes overlays in Web Inspector, including new UI settings for toggling order number visibility. ([304645@main](https://commits.webkit.org/304645@main)) (166648769) - Added support for visualizing gaps between items in the masonry axis of `grid-lanes` layouts within the Web Inspector grid overlay. ([304861@main](https://commits.webkit.org/304861@main)) (166984079) #### Resolved Issues - Fixed the Styles sidebar filter in Web Inspector to be case-insensitive. ([304153@main](https://commits.webkit.org/304153@main)) (36086981) - Fixed context menu items to rename `Copy HTTP Request` and `Copy HTTP Response` to `Copy HTTP Request Headers` and `Copy HTTP Response Headers` for clarity. ([304768@main](https://commits.webkit.org/304768@main)) (117708766) - Fixed an issue where the Sources navigation sidebar could be empty when reloading the page. ([304221@main](https://commits.webkit.org/304221@main)) (166141968) - Fixed timestamp formatting in the Web Inspector to remove unnecessary trailing `.0` values for readability. ([304851@main](https://commits.webkit.org/304851@main)) (166500013) - Fixed item order labels in the Web Inspector grid and flex overlays to remove the `#` symbol, changing from `Item #N` to `Item N`. ([304771@main](https://commits.webkit.org/304771@main)) (166767949) ### WebAssembly #### Resolved Issues - Fixed `Error.isError(WebAssembly.Exception)` to correctly return `false` based on current WebAssembly spec semantics. ([304917@main](https://commits.webkit.org/304917@main)) (167110254) ### WebRTC #### Resolved Issues - Fixed `RTCDataChannelInit` to support `[EnforceRange]` on the `maxPacketLifeTime` and `maxRetransmits` fields to align with the WebRTC specification. ([304499@main](https://commits.webkit.org/304499@main)) (133630397) - Fixed an issue where `RTCDataChannel` close events did not fire when `RTCPeerConnection` was closed. ([304859@main](https://commits.webkit.org/304859@main)) (165617848) --- Copyright © 2026 Apple Inc. 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