---
title: Safari 27 Beta Release Notes
framework: safari-release-notes
role: article
role_heading: Article
path: safari-release-notes/safari-27-release-notes
---

# Safari 27 Beta Release Notes

Released June 8, 2026 — 27.0 beta (20625.1.18)

## Overview

Overview Safari 27 beta is available for iOS 27 beta, iPadOS 27 beta, visionOS 27 beta, macOS 27 beta, macOS 26, and macOS Sequoia. Accessibility Resolved Issues Fixed an issue where calling speechSynthesis.cancel() removed utterances queued by subsequent speechSynthesis.speak() calls. (46151521) Fixed an issue where SVG <use> elements referencing <symbol> elements inside an <img> were incorrectly included as unnamed images in VoiceOver’s Images rotor. (98999595) Fixed an issue where changing the id attribute of an element targeted by aria-owns did not update the accessibility tree. (107644248) Fixed slot elements referenced by aria-labelledby to correctly use their assigned slotted content for accessible names and ignore hidden slotted nodes. (114500560) Fixed <meter> element to have consistent labels between aria-label and title attributes. (127460695) Fixed elements with display: contents and content in a shadow root to have their content properly read when referenced by aria-labelledby. (129361833) Fixed aria-labelledby to use the checkbox name instead of its value when the checkbox name comes from an associated <label> element. (141564913) Fixed VoiceOver cursor positioning for elements focused via the drawFocusIfNeeded() canvas API. (146323788) Fixed grid elements with child rows in a shadow root to properly work with VoiceOver. (153134654) Fixed an issue where VoiceOver read text within images that have role="presentation". (159304061) Fixed an issue where content within dynamically expanded <details> elements was not exposed in the accessibility tree. (159865815) Fixed an issue where the contextmenu event was not fired for elements inside iframes when triggered by keyboard or assistive technology actions such as VoiceOver’s VO+Shift+M. (164128676) Fixed an issue where changes to <input type="button"> elements inside live regions were not announced by assistive technologies. (168200460) Fixed ::first-letter text not being exposed in the accessibility tree when no other text accompanies it. (168458291) Fixed an issue where VoiceOver was unable to access aria-owned rows and their cells in grids and tables. (168770938) Fixed an issue where VoiceOver could not find focusable splitter elements when navigating to the next or previous form control. (170187464) Fixed an issue where color picker inputs could not be activated using VoiceOver’s press action. (172218114) Fixed an issue where interactive elements containing an <svg> named by a child <title> element did not expose an accessible name. (172559238) Fixed an issue where incorrect bounding boxes were computed for MathML table rows and cells. (172851295) Fixed an issue where comboboxes did not forward focus to their aria-activedescendant, preventing assistive technologies from interacting with list items. (172931277) Fixed an issue where aria-owns was not respected when computing the accessible name from element content. (173249317) Fixed VoiceOver line-by-line reading skipping content in read-only documents. (174349841) Fixed invalidation of aria-hidden=“true” when focus lands inside the aria-hidden subtree. (174449524) Fixed VoiceOver’s “Skip redundant labels” setting not being respected on certain web pages. (176297111) Animations New Features Added the animation property to AnimationEvent and TransitionEvent interfaces. (176527591) Resolved Issues Fixed an issue where animation-fill-mode did not correctly apply viewport-based units after the viewport was resized. (80075191) Fixed an issue where !important declarations did not override CSS animation values when CSS transitions were also running on the same property. (174367827) Fixed an issue where identity matrix decomposition generated invalid quaternions, resulting in incorrect transform animations. (174813328) CSS New Features Added support for contain: style applying to CSS quote counters, as specified in CSS Containment Level 2. (84758186) Added support for the case-sensitive modifier s in CSS attribute selectors. (126331481) Added support for the stretch keyword in box sizing properties. (132539604) Added support for the :host:has() compound selector in CSS. (139799278) Added support for the :heading pseudo-class. (158759228) Added support for the revert-rule keyword, which rolls back the cascade to behave as if the current style rule had not been present. (171132753) Added support for the normal and none values on the position-anchor CSS property. (172097721) Added support for the insert keyword for the text-autospace property. (175031507) Added support for transform-aware anchor positioning. (175401339) Resolved Issues Fixed an issue where -webkit-text-fill-color incorrectly overrode text-decoration-color. (47010945) Fixed shape-outside computing incorrect text wrapping in RTL writing modes. (56890238) Fixed flex layout to use the used flex-basis instead of the specified value for definiteness evaluation. (85707621) Fixed an issue where the outline offset was too large for outline: auto on macOS. (94116168) Fixed an issue where element positioning was incorrect when the containing block was an anonymous block. (96548847) Fixed an issue where box-shadow did not work on display: table-row elements. (96914376) Fixed text-indent with calc() containing percentages to correctly treat percentage components as zero for intrinsic size contributions. (97025949) Fixed an issue where out-of-flow content had an incorrect height when set to fit-content. (97492632) Fixed an issue with percentage size resolution in flex items in quirks mode. (100183902) Fixed an issue where clip-path: inset() border-radius values did not render correctly at certain element and clip-path sizes. (110847266) Fixed -webkit-box flexbox emulation not sizing children correctly inside <fieldset> elements. (114094538) Fixed: Improved performance on pages using :where and :is selectors. (114904007) Fixed an issue where elements with display: table could have incorrect layout when borders were present. (116110440) Fixed aspect-ratio not being respected on flex children when the flex container has position: absolute. (117807518) Fixed aspect-ratio not working correctly on flex children that also have overflow set. (118926827) Fixed font-family serialization to preserve quotes around family names that match CSS-wide keywords or generic families. (125334960) Fixed an issue where elements with border, position: absolute, and aspect-ratio: 1 were not rendered as squares. (126292577) Fixed an issue where perspective-origin failed to resolve var() references when used as the second value, preventing animations from being applied. (131288246) Fixed :focus-visible incorrectly matching after a programmatic focus() call triggered by clicking a button with child elements. (134337357) Fixed an issue where the bottom margin of a last child element collapsed out of a parent with min-height. (134356544) Fixed a performance issue where pages with many DOM manipulations and complex :has() selectors could freeze. (138431700) Fixed an issue where a font was downloaded despite no characters in the document falling within its unicode-range. (140674753) Fixed an issue where @media (prefers-color-scheme: dark) inside an iframe did not match when the iframe’s color-scheme was set to dark. (142072593) Fixed an issue where background-clip: text did not work on table header elements. (142812484) Fixed an issue where width: 0 did not collapse a table cell to its minimum size. (142814603) Fixed an issue where :has(:empty) continued to match after the targeted element’s content was dynamically changed to no longer be empty. (143864358) Fixed an issue where floats and out-of-flow objects could be incorrectly adjacent to anonymous blocks. (144481961) Fixed an issue where text gradually disappeared when toggling text-transform on elements with ::first-letter styling. (145550507) Fixed an issue where height: max-content resolved to zero on absolutely positioned elements when a child had max-height: 100%. (147333178) Fixed an issue where tables with collapsed borders incorrectly calculated the first row width, causing excess border width to spill into the table’s margin area. (149675907) Fixed an issue where an inline-flex container with flex-direction: column did not update its width to match the intrinsic size of a child image when the image was not cached. (150260401) Fixed CSS zoom interacting incorrectly with font-weight, font-style, and font-variant on iPad. (152173269) Fixed an issue where non-replaced elements with aspect-ratio enforced the automatic minimum size even when min-width was explicitly set to 0. (156837730) Fixed image aspect-ratio not being preserved when width: 100% and height: 100% are set but no ancestor has a defined width. (162373271) Fixed an issue where an element can’t anchor to its previous sibling. (162903640) Fixed :has() style invalidation performance for selectors where :has() is in non-subject position. (163512170) Fixed an issue where RTL grid scrollable areas did not correctly account for grid layout and scrollbars. (167792896) Fixed pixel snapping to be applied consistently for all border-width value types. (168240347) Fixed rendering of linear gradients when all color stops are at the same position. (169063497) Fixed an issue where inset box-shadow was incorrectly positioned on table cells with collapsed borders. (169254286) Fixed position-try-order to interpret logical axis values using the containing block’s writing mode instead of the element’s own writing mode. (169501069) Fixed an issue where children with percentage heights inside absolutely positioned elements using intrinsic height values (fit-content, min-content, max-content) incorrectly resolved against the containing block’s height instead of being treated as auto. (171179193) Fixed an issue where percent-height replaced elements computed stale preferred widths in shrink-to-fit containers. (171184282) Fixed a regression where @scope styles did not apply to slotted elements in web components. (171383788) Fixed an issue where the table cell nowrap minimum width calculation quirk was applied outside of quirks mode. (171410252) Fixed a performance issue where contain: layout caused significantly slower forced layouts when all siblings created their own formatting context. (171545381) Fixed an issue where dynamically inserting text before existing content did not update ::first-letter styling. (171649994) Fixed an issue where underlines were split when a ruby base was expanded due to long ruby text. (171653095) Fixed an issue where changing color-scheme did not repaint iframe background. (171658244) Fixed an issue where nested children of a popover element failed to render when using position: absolute. (171735933) Fixed an issue where color: initial resolved to the wrong color when the system is in dark mode. (172320282) Fixed an issue where an element with display: contents did not establish an anchor scope when using anchor-scope. (172355302) Fixed an issue where ordered list numbers with large starting values were clipped off-screen. (172515216) Fixed <general-enclosed> in media queries to reject content with unmatched close brackets per the <any-value> grammar. (172575115) Fixed an issue where the rlh unit was double-zoomed with evaluation-time CSS zoom. (172798163) Fixed an issue where anchor-positioned elements anchored to children of sticky-positioned boxes did not stick correctly. (172884148) Fixed an issue where pseudo-elements were not sorted correctly when sorting anchor elements by tree order. (173032203) Fixed outline: auto to correctly respect zoom. (173068660) Fixed transferred min/max block-size constraints not being applied for intrinsic keyword widths on replaced elements. (173128588) Fixed outline-offset to work correctly with outline: auto on iOS. (173130230) Fixed :active, :focus-within, and :hover pseudo-classes to correctly account for elements in the top layer. (173145294) Fixed a regression where the ic length unit was incorrectly affected by page scaling. (173198587) Fixed the shape() function to omit default control point anchors in computed value serialization per the CSS Shapes specification. (173233716) Fixed: Updated SVG and MathML user agent style sheets to use :focus-visible instead of :focus. (173321368) Fixed an issue where lh and rlh units resolved with double-zoom when line-height was a number value. (173448638) Fixed outline-width to be ignored when outline-style is auto, matching the specification. (173567890) Fixed :in-range and :out-of-range pseudo-classes for time inputs with reversed ranges. (173589851) Fixed :placeholder-shown to correctly match input elements that have an empty placeholder attribute. (173604635) Fixed an issue where ligatures caused a non-zero layout width for text with font-size: 0. (173840866) Fixed computed value of auto insets or margins as returned by getComputedStyle() to be zero, if the element uses position-area or anchor-center. (173885561) Fixed position-area not being able to anchor to an element positioned using anchor functions. (173964030) Fixed :in-range and :out-of-range pseudo-classes to correctly update when the readonly attribute changes. (173978657) Fixed an issue where view-timeline-inset serialization failed to coalesce identical values. (174096313) Fixed CSS variable cycle detection to match the CSS Values Level 5 specification. (174105259) Fixed url() token serialization in CSS custom properties. (174144616) Fixed text-autospace to correctly handle supplementary Unicode characters. (174148315) Fixed an issue where flex items with different order values caused incorrect baseline alignment. (174241817) Fixed an issue where hovering over ::first-letter text showed a pointer cursor instead of the expected I-beam cursor. (174258447) Fixed an issue where display: grid on a <fieldset> element added extra unnecessary space below its content. (174301311) Fixed outline radii rendering for elements with a non-auto outline-style. (174328839) Fixed an issue where aspect-ratio was not honored when the page was zoomed in. (174361289) Fixed replaced elements to use the transferred size through intrinsic aspect ratio for min-content and max-content sizing. (174386310) Fixed an issue where height: 100% on a child element altered the layout when the parent’s height was defined via aspect-ratio. (174448267) Fixed margin collapse to be allowed when the preferred block size behaves as auto, per the CSS Sizing specification. (174547610) Fixed an issue where document.styleSheets and shadowRoot.styleSheets incorrectly included adopted style sheets, which per the CSSOM specification should only appear in the final CSS style sheets list used for style resolution. (174583340) Fixed the CSSOM preferred style sheet set name to be established at sheet creation time based on insertion order rather than tree order. (174586058) Fixed highlight pseudo-elements such as ::selection and ::highlight to disallow vendor-prefixed properties, aligning with the CSS Pseudo-Elements specification. (174590593) Fixed cycle detection and nested function call handling in CSS custom functions. (174609179) Fixed FontFace.loaded to reject when a local() font source fails to load. (174631384) Fixed an issue where word-break: break-all incorrectly allowed CJK close punctuation to appear at the start of a line. (174656971) Fixed an issue where word-break: keep-all incorrectly suppressed line break opportunities at CJK punctuation characters. (174658701) Fixed the FontFace constructor to reject with a SyntaxError instead of a NetworkError when a BufferSource fails to parse, per the CSS Font Loading specification. (174669738) Fixed the FontFace family attribute to return the serialization of the parsed value. (174698351) Fixed grid layout to correctly handle percentage and calc() values for the specified size suggestion. (174863227) Fixed :has() sibling invalidation issues related to relation forwarding. (175006235) Fixed an issue where min-width: auto was not correctly computed for flex items. (175157619) Fixed an issue where percentage heights inside flex items did not resolve correctly in quirks mode. (175158571) Fixed an issue where margin-trim: block-start did not apply to blocks nested inside inline boxes. (175162899) Fixed an issue where dynamically changing display: contents on a <fieldset> legend caused incorrect rendering. (175163337) Fixed: Improved :has() invalidation performance by including the full selector context in invalidation selectors. (175177078) Fixed the CSS preload scanner to resolve relative @import URLs against the <base> element URL. (175305190) Fixed -webkit-box flex distribution for children with orthogonal writing modes. (175323734) Fixed calc(infinity) as a flex-grow factor not stretching a flex item to 100% width. (175431146) Fixed :has() sibling invalidation failing due to an internal bitfield overflow, causing stale styles when siblings are added or removed. (175433733) Fixed :has() invalidation for sibling combinators when elements are inserted or removed from the DOM. (175441568) Fixed transition-property not preserving the specified case of <custom-ident> values during serialization. (175467206) Fixed the will-change property not serializing correctly when used with non-property identifiers or identifiers in a non-standard case. (175482352) Fixed percentage top and bottom values on relatively positioned elements not resolving when the containing block has aspect-ratio. (175502356) Fixed: Updated the enhanced <select> element to use self-* keywords for anchor positioning. (175505107) Fixed serialization of multi-word font family names that were always incorrectly quoted due to treating the full string as a single identifier. (175522811) Fixed text-indent computation when tab stop positions are involved. (175529961) Fixed calc() margin computations in flex layout. (175532405) Fixed calc() margin computations for block, fieldset, and table caption layouts. (175548980) Fixed handling of <li> value attributes in reversed ordered lists. (175558324) Fixed CSS trigonometric functions to correctly convert degrees to radians. (175575617) Fixed sibling-index() and sibling-count() inside calc() functions to be correctly simplified. (175590806) Fixed sibling-index() and sibling-count()to correctly return 0 when used in cross-tree ::part() styling. (175592607) Fixed the CSS resize handle not working on an element when the handle overlaps a child iframe. (175621855) Fixed flex container baseline alignment being incorrectly computed for scroll containers by clamping to the border edge. (175631095) Fixed an issue where inline-level boxes with calc() margins or padding lost the fixed component during intrinsic width computation. (175669222) Fixed floats with margin-start incorrectly overlapping adjacent floats. (175669464) Fixed aspect-ratio calculations for block-level elements with size constraints. (175669713) Fixed aspect-ratio calculations for flex items with percentage cross-size constraints. (175669774) Fixed aspect-ratio calculations for flex items with definite cross-size values. (175690028) Fixed revert-layer computing incorrectly when there is a leading empty or space substitution value. (175729680) Fixed :has() invalidation incorrectly resetting sibling relation bits, causing style invalidation failures for first-in-sibling-chain elements. (175738008) Fixed CSSStyleDeclaration.setProperty() failing to apply !important priority to an existing inline style property when the value was an integer of 255 or lower. (176099619) Fixed an issue where flex items with explicit min-height: min-content were incorrectly treated as scrollable, zeroing out their minimum size. (176173688) Fixed :has() invalidation performance when used inside nested :is() selectors. (176354723) Fixed an issue where elements using stretch sizing inside anonymous block wrappers resolved to their intrinsic size instead of stretching to fill the available space. (176398251) Fixed sibling-count() & sibling-index() used in @keyframes to re-resolve when siblings change. (176531901) Fixed :has() style invalidation failing in complex nested cases involving :is(). (176719780) Fixed -webkit-perspective not establishing a containing block for fixed-positioned descendants. (176729670) Fixed nested multi-column layouts with three or more levels failing to paginate content across pages. (176741498) Fixed :has() selector performance by using scope selectors to limit style invalidation traversal for class, attribute, and pseudo-class changes. (176771971) Fixed non-replaced blocks with aspect-ratio and a percentage max-width collapsing to zero width during intrinsic sizing. (176873776) Fixed percentage max-width on elements with aspect-ratio resolving against the wrong axis in perpendicular writing modes. (176879597) Fixed z-index not applying to statically-positioned display: -webkit-box items to align with Firefox and Chrome behavior. (176886461) Fixed flex containers using box-sizing: border-box providing the wrong cross size to stretched flex items. (176989934) Fixed flex containers with aspect-ratio-derived height not providing a definite cross size to their flex items. (177085129) Fixed SVG images with no intrinsic dimensions collapsing to zero height inside column flex containers. (177086497) Canvas Resolved Issues Fixed an issue where a 2D canvas element unnecessarily forced a compositing layer. (172864747) Editing New Features Added menu items to convert editable text between Simplified and Traditional Chinese characters in the “Transformations” submenu. (156354464) Resolved Issues Fixed an issue where characters styled with ::first-letter were not selectable. (5688237) Fixed an issue where explicitly setting a font size that matched a legacy <font> size would be incorrectly substituted with the legacy size, causing inconsistent rendering across different default font size configurations. (15292320) Fixed an issue where the Font Picker style selection became unusable after changing fonts when editing multiple lines of text. (110651645) Fixed an issue where adjusting text selection with touch handles was prevented by JavaScript touch event handling on some websites. (151851274) Fixed an issue where execCommand('FormatBlock') did not preserve inline styles of replaced block elements, causing text formatting to be lost when pasting content. (157657531) Fixed an issue where text-indent flickered or was ignored on contenteditable elements while typing. (170280101) Fixed an issue where text selection would jump unexpectedly when selecting absolutely-positioned content inside an element with user-select: none. (170475401) Fixed an issue where text selection was lost when focus transitioned from a contentEditable element to a non-editable target. (171221909) Fixed an issue where composition events were dispatched in the wrong order during IME input, causing incorrect character rendering with Devanagari and other input methods. (174330850) Fixed a regression where Vietnamese and Korean keyboard input methods incorrectly exited modeless composition mode, requiring a double spacebar press to complete each word. (176847897) Fixed a recent regression that “Zhuyin - Traditional” input method stalling for multiple seconds when composing Chinese text. (177042301) Encoding Resolved Issues Fixed an issue where CJK encoding state was not reset appropriately during text decoding. (174649963) Forms New Features Added the customizable <select> element, allowing custom styling with appearance: base-select and custom content with the <selectedcontent> HTML element. (170328089) Resolved Issues Fixed an issue where keyboard commands such as paste did not work in form fields that restrict input to numbers. (4360235) Fixed an issue where keyboard tabbing position was lost when a focused button became disabled, causing focus to jump to the beginning of the page. (120676409) Fixed an issue where small range input slider thumbs were difficult to interact with on iPadOS and visionOS by expanding their touch hit area. (147428926) Fixed <datalist> suggestions appearing with with white text on a white background in dark mode after typing. (168676757) Fixed an issue on iOS where typing into an <input> element associated with a <datalist> was intercepted by type-to-select behavior. (173346270) Fixed: Made the <input type="checkbox" switch> control behave more like other controls with regards to native appearance CSS properties. (173487610) Fixed an issue where <select multiple> did not always fire onchange when the mouse button was released far outside the element. (173882861) Fixed an issue where <select> control rendering was broken in vertical writing mode. (174068353) Fixed a performance issue where parsing <select> elements with thousands of <option> children via innerHTML caused O(n²) overhead due to repeated list recalculation. (174244946) Fixed an issue where date and time input types without min or max attributes incorrectly matched the :in-range pseudo-class. (174829899) Fixed an issue where cloned <input> and <textarea> elements did not preserve their user-modified state. (174892989) Fixed <option> elements to correctly implement the HTML specification’s dirtiness concept for tracking user-modified selected state. (175306111) Fixed the select picker appearing at an incorrect position when the <select> element is anchor positioned. (175454476) Fixed the default display value for <optgroup> and <option> elements to block, matching the behavior of other browsers. (175473184) Fixed field-sizing: content clipping the placeholder on number inputs that have no value. (175883299) Fixed <option> and <optgroup> elements to match the :disabled pseudo-class when inside a disabled <select>. (176559708) HTML New Features Added support for the auto keyword in the sizes attribute on <img> elements, enabling automatic size calculation based on the rendered layout width. (172827205) Added support for the shadowrootslotassignment attribute on declarative shadow roots. (173227340) Added support for tabindex, focus(), blur(), and autofocus on MathML elements per the HTML Standard. (176258900) Resolved Issues Fixed an issue where an HTML map element without a name attribute did not match its associated image using the id attribute. (12359382) Fixed sequential focus navigation to skip elements that do not meet the specification’s focusability requirements. (103370883) Fixed viewport <meta> parsing to correctly treat form feed as ASCII whitespace per the HTML specification. (108440799) Fixed parsing of javascript: URLs to align with the specification. (147612682) Fixed a severe performance regression causing dynamic insertion of <img> elements with a src attribute to be dramatically slower than other browsers. (166201075) Fixed an issue where a third nested <iframe> using the srcdoc attribute did not render. (167917471) Fixed incorrect parsing of pixel-length margin attributes on <body>, <iframe>, and <frame> elements. (171240848) Fixed an issue where replaceWith() stopped processing remaining nodes if a script in the replacement removed a sibling. (172753019) Fixed an issue where HEIC images were incorrectly converted to JPEG when uploaded via drag-and-drop or file input. (173206598) Fixed the HTML preload scanner to skip preloading stylesheets that have the disabled attribute. (173378582) Fixed an issue where setting the rel attribute on an <a> element multiple times did not clear prior link relations. (173567839) Fixed the HTML parser fast path to correctly process escaped attribute values longer than one character. (173673581) Fixed the HTML parser fast path to correctly detect nested <li> elements. (173983892) Fixed the HTML parser fast path to use the adjusted current node for MathML and SVG integration point checks. (174096305) Fixed document named item collection to include all <object> elements, aligning with other browser engines. (174537345) Fixed window.open() to correctly consume user activation when creating a new browsing context, aligning with the HTML specification. (174587258) Fixed remaining issues with <img sizes="auto"> to fully align with the specification. (174684058) Fixed nested calls to requestClose() incorrectly firing multiple cancel events and causing a stack overflow. (174850509) Fixed requestClose() incorrectly removing the open attribute when called on a disconnected dialog element. (174855725) Fixed an issue where dir=auto on <slot> elements did not update when slotted content changed. (174871706) Fixed an issue where <option> elements rendered incorrectly when the label attribute was empty. (174979446) Fixed an issue where the preload scanner incorrectly skipped <source> elements with an empty type attribute inside <picture>. (175094037) Fixed innerText to emit a newline for empty <option> or <optgroup> inside <select>. (175245381) Fixed HTML floating-point number parsing to correctly handle values with a leading + sign. (175300431) Fixed innerText to no longer emit newlines for visibility: hidden block elements. (175569426) Fixed innerText to correctly emit blank lines around <p> elements regardless of their CSS display value. (175729427) Fixed the speculative preload scanner to no longer incorrectly preload scripts inside SVG elements. (175800116) Fixed <a rel="ar"> elements wrapping <model> elements to correctly enter ARQL without extra steps and to display the AR badge. (176410897) Fixed innerText on tables to no longer emit spurious trailing newlines and to preserve row-exit newlines after empty rows. (176635985) Fixed the HTML preload scanner not preloading resources referenced by legacy <image> tags. (176712749) Fixed an issue where history.pushState() and history.replaceState() did not work correctly with custom URL schemes. (177547157) Deprecations Deprecated the href attribute on all MathML elements except <a>. (173996661) Images Resolved Issues Fixed an issue where inserting an image with a srcset attribute into a dynamically created iframe resulted in an invisible image. (66849050) Fixed naturalWidth and naturalHeight returning incorrect values for SVG images without intrinsic dimensions. (141196049) Fixed an issue where HDR images would flicker and lose their HDR appearance when overlapping layers animate. (163382580) Fixed an issue where adopting a standalone img element did not update its image data. (172856773) Fixed rendering performance of HDR images that have gain-maps by using GPU-backed surfaces. (176605566) JavaScript New Features Added support for static import defer semantics. (176568369) Resolved Issues Fixed multiple top-level await correctness bugs with a rewrite of the ES module loader for standards compliance. (97370038) Fixed regular expressions in Unicode mode to not count non-capturing groups and modifiers toward the number of available backreferences. (167746769) Fixed %TypedArray%.prototype.subarray to calculate beginByteOffset correctly to align with ECMA-262. (168143600) Fixed the trace behavior of RegExp.prototype[Symbol.split] to align with ECMA-262. (168288878) Fixed Array.prototype.concat to correctly handle arrays with indexed accessors, preventing getter reentry from bypassing Symbol.isConcatSpreadable checks. (172237596) Fixed an issue where a greedy or non-greedy non-BMP character class in a regular expression could advance the index past the end of input. (172978772) Fixed an issue where class instance field initializers did not have the correct evaluation context when used inside arrow functions and nested scopes. (173296563) Fixed TypedArray [[Set]] to check the receiver before writing to the typed array. (173386404) Fixed %ArrayIteratorPrototype%.next() to return { done: true } instead of throwing a TypeError when the source TypedArray is detached and the iterator has already completed. (173759106) Fixed an issue where a fixed-count mixed-width character class in a regular expression did not correctly restore the index on backtrack. (173972458) Fixed an issue where regular expressions with non-BMP characters could skip valid match positions when alternating between patterns. (174200307) Fixed an issue where regular expression captures were not properly cleared when backtracking out of fixed-count parenthesized groups and negative lookaheads. (174201284) Fixed an issue where import { "*" as x } was incorrectly treated as a namespace import instead of a named import using the string "*" as a ModuleExportName. (174314099) Fixed an issue where RegExp.prototype.exec and RegExp.prototype.test could match against a stale pattern if lastIndex has a valueOf that calls RegExp.prototype.compile. (174461752) Fixed an issue where async functions using module-scoped variables could fail when the DFG JIT optimized scope resolution. (174626957) Fixed an issue where Intl.Segmenter with granularity: "word" incorrectly reported isWordLike: false for numeric segments. (175057894) Fixed Object.defineProperties to call Proxy traps in the correct order. (175068687) Fixed an issue where Intl.Locale did not canonicalize before overriding the language. (175092327) Fixed time zone identifiers to return primary IANA time zone IDs instead of legacy ICU identifiers. (175098682) Fixed the Array ToPrimitive fast path incorrectly ignoring overrides of Object.prototype.valueOf. (175122250) Fixed input position corruption in regular expression backward matching when rewinding over a surrogate pair. (175122467) Fixed Intl.DateTimeFormat to preserve the original legacy timezone identifier instead of replacing it with the primary IANA ID. (175206605) Fixed Promise.prototype.finally to throw a TypeError when @@species is not a constructor, matching the behavior of other browsers. (175290627) Fixed the regular expression engine to reject dangling hyphens in character class syntax when using the /v flag. (175559808) Fixed a performance issue with module resolution by limiting cache population to star-resolution and indirect-resolution cases. (175826413) Fixed a performance issue with TypedArray.prototype.lastIndexOf by adding SIMD-accelerated reverse search for numeric types. (175904377) Fixed a performance issue where building a module namespace with many export * statements was significantly slower than necessary. (175949532) Fixed DataView constructor to match specification-defined argument validation order and error throwing behavior. (176110210) Fixed an issue where Array.prototype.concat could produce incorrect results when combining arrays with incompatible indexing types. (176219964) MathML New Features Added support for multiple-character operators in MathML. (170907545) Added support for operator dictionary entries for multi-character operators to align with the MathML Core specification. (176543727) Resolved Issues Fixed the MathML operator dictionary to correct the stretchy property for several operators, resolving Web Platform Test failures. (170901728) Fixed an issue where symmetric non-stretchy large operators were not centered around the math axis. (170905663) Fixed an issue where dynamic changes to <mo> element attributes did not trigger a relayout. (170907029) Fixed an issue where minsize and maxsize defaults and percentages did not use the unstretched size as specified. (170908253) Fixed positioning of the <mprescripts> element within <mmultiscripts> layout. (170909975) Fixed an issue where the MathML fraction bar was not painted when its thickness was equal to its width. (170934351) Fixed an issue where <none> and <mprescripts> elements were not laid out as <mrow> elements in MathML. (170940035) Fixed an issue where MathML token elements ignored -webkit-text-fill-color when painting math variant glyphs. (172020318) Fixed padding and border rendering on <msqrt> and <mroot> elements and corrected token sizing for mathvariant. (173081436) Fixed absolute positioning of elements inside MathML by ensuring logical height is updated. (173088146) Fixed tabIndex values not being set correctly for MathML elements. (174734133) Fixed spacing values for prefix operators +, −, ±, ∓, ∇, and infix operator ⋉ in the MathML Core operator dictionary. (176652211) Fixed the operator dictionary entry for the ∂ prefix operator to use the correct spacing values (3, 0) instead of (2, 1). (176693587) Fixed nonce-hiding support for MathML elements to align with the HTML specification. (176875058) Media New Features Added support for setting TextTrackCue.endTime to Infinity to represent an unbounded cue duration. (71042767) Added support for synchronized video playback on displays using genlock on macOS. (311815@main, 312166@main)  (175197574) Resolved Issues Fixed an issue where decoding WebM audio files with more than two channels would fail. (82160691) Fixed an issue where preservesPitch and playbackRate were not correctly handled on an HTMLMediaElement connected to an AudioContext via createMediaElementSource. (93275149) Fixed MediaCapabilities.decodingInfo() incorrectly reporting VP8 in WebM as not supported. (127339546) Fixed an issue on iPad where exiting fullscreen on a media document incorrectly navigated back to the previous page instead of returning to the inline view. (137220651) Fixed an issue where the WebCodecs VideoDecoder API output frames in an incorrect order for videos containing B-frames. (145093697) Fixed an issue where the darkening overlay on inline video controls made accurate scrubbing difficult and displayed video content incorrectly on macOS. (161271114) Fixed an issue where WebM with VP9/Vorbis fallback would not play. (164053503) Fixed video playback failing when the declared MIME type in a <source> element does not match the actual content type served by the server. (166181001) Fixed an issue where text selection was broken after pausing a video when the media player ran in the content process. (167727538) Fixed HTMLMediaElement.currentTime to report smoothly progressing values instead of updating only at fixed intervals. (170115677) Fixed an issue where MP4 files containing Opus audio tracks could not be decoded with decodeAudioData. (170196423) Fixed an issue where the VideoFrame constructor did not handle the video color range correctly for NV12 (I420 BT601) video frames. (170299037) Fixed an issue where Live Text selection was unavailable on paused fullscreen videos. (170817667) Fixed an issue where FairPlay-protected VP9 content failed to play via MediaSource. (171210968) Fixed an issue where autoplay would proceed before default text tracks finished loading. (171699293) Fixed the currentTime getter to return defaultPlaybackStartPosition when no media player exists. (171722368) Fixed HTMLMediaElement to fire a timeupdate event when resetting the playback position during media load as required by the specification. (171785463) Fixed an issue where the media player preload attribute was not properly updated when the autoplay attribute was set. (171883159) Fixed an issue where seeking in a WebM video did not work correctly while content was still loading. (172473039) Fixed an issue where media playback could not move to the next item in a playlist when the tab was in the background. (172676372) Fixed an issue where scrubbing a video in full-screen mode could cause it to exit full-screen. (172682230) Fixed an issue where HDR video content appeared washed out due to colorspace information being lost during processing. (172721079) Fixed Encrypted Media Extensions to check support for the full content type including codecs, rather than only the MIME type. (173852931) Fixed an issue where setting HTMLMediaElement.volume had no effect when the element was connected to an AudioContext. (174278899) Fixed ImageCapture to correctly queue takePhoto() and applyConstraints() requests to avoid concurrent capture session reconfiguration. (174950018) Fixed a regression where videos would stop playing and lose audio after a few seconds on some websites. (174966899) Fixed an issue where U+0000 (NULL) characters were not allowed in VTTCue text content. (175084171) Fixed video content disappearing after switching to another tab and back. (175257980) Fixed WebVTT cue settings line parsing failures. (175296476) Fixed ::cue() selectors to correctly match the WebVTT root object in addition to child nodes. (175550173) Fixed currentTime on iOS to update more frequently during media playback. (175774587) Fixed Media Source Extensions readyState not being updated immediately when playback stalls due to a gap in buffered data. (176330683) Fixed timeupdate events being fired during seeking before the seek operation completes. (176861767) Fixed the ended event not always firing when the MediaSource duration is changed to match the current playback position. (176863546) Fixed a MediaSource issue where the decode-key cleanup in coded frame processing was incorrectly removing non-orphaned samples. (176971800) Fixed currentTime() returning a stale value after the playback rate was changed from zero to a non-zero value. (177046564) Networking New Features Added support for secure cookies on loopback hosts. (137604100) Resolved Issues Fixed redirects to data: URLs to be blocked for subresources such as images and scripts, aligning with the Fetch specification. (74165956) Fixed XMLHttpRequest incorrectly dropping the request body during redirects. (98459882) Fixed X-Frame-Options to only strip tab or space characters, not vertical tabs. (126915315) Fixed an issue where Safari’s address bar could display an internationalized domain name (IDN) homograph as a visually identical legitimate Latin domain, enabling potential phishing attacks. (166796168) Fixed an issue where the preload scanner did not include integrity metadata in requests, causing incorrect Integrity-Policy violation reports. (168280745) Fixed range request validation to properly handle HTTP 416 (Requested Range Not Satisfiable) responses. (168487440) Fixed a regression where the referrer could be missing after a process-swap navigation. (169006635) Fixed incorrect URL query percent-encoding when using non-UTF-8 character encodings such as iso-8859-2, windows-1250, and gbk. (169566553) Fixed an issue where the multipart form data parser incorrectly required CRLF after the closing delimiter, causing some web applications to fail to render correctly. (174348783) Fixed an issue where partitioned cookies could not be deleted via WKHTTPCookieStore. (174557252) PDF Known Issues Fixed PDF scrollbars to adapt to dark appearance. (174763396) Resolved Issues Fixed an issue where panning a zoomed-in PDF on iOS would frequently rubber band back to the starting position. (156854435) Printing Resolved Issues Fixed an issue where animations were ignored during print, causing missing content on animated pages. (36901701) Fixed an issue where printing light text on a dark background with backgrounds disabled could result in invisible text. (170070133) Fixed a regression where printing a WebView embedded in an enclosing NSPrintOperation dropped all text. (174756900) Rendering New Features Added support for subpixel inline layout, enabling more precise text and inline element positioning. (171835370) Added support for anchor-valid and anchor-visible as aliases of anchors-valid and anchors-visible in position-visibility. (174438361) Added support for the Dutch IJ digraph in text-transform: capitalize and ::first-letter, correctly titlecasing “ij” to “IJ” at word starts when the content language is Dutch. (175912959) Resolved Issues Fixed an issue where table cells with rowspan values exceeding the actual number of rows were incorrectly computing heights. (3209126) Fixed an issue where ::first-letter styles caused Range.getClientRects() and Range.getBoundingClientRect() to return incorrect dimensions. (71546397) Fixed incorrect distributed height in table rows when a <td> element has an explicit height set. (78549188) Fixed an issue where U+2028 LINE SEPARATOR was not rendered as a forced line break. (88470339) Fixed an issue where a block formatting context with margin-start could overlap an adjacent float. (93187697) Fixed position: relative on table rows (<tr>) to correctly establish a containing block for absolutely positioned descendants. (94294819) Fixed <marquee> elements causing incorrect table width calculations. (99826593) Fixed boxes in the top layer to use the initial containing block as their static-position rectangle. (155495104) Fixed an issue where a flex item containing a percentage-height image did not shrink correctly around the image. (156902823) Fixed an issue where form controls with height: 100% in auto-height containers incorrectly resolved to zero height. (161699543) Fixed incorrect box sizing on inline elements when they have no siblings and their padding-left plus margin-left equals zero. (162376969) Fixed a regression where an element inside an iframe gaining its own compositing layer could cause an iframe’s semi-transparent background to appear darker.(163509267) Fixed an issue where space-taking scrollbars did not trigger a proper re-layout when the box size depends on content size. (166836126) Fixed an issue where View Transition snapshots were incorrectly stored in sRGB, causing rendering issues with non-sRGB colors. (167634138) Fixed an issue where font subpixel quantization was unnecessarily disabled in some cases, improving text rendering quality. (168088611) Fixed table layout to properly handle visibility: collapse on columns. (168556786) Fixed intrinsic sizing for absolutely positioned replaced elements. (168815514) Fixed text being incorrectly truncated in RTL containers when combined with text-overflow: ellipsis and an inline-block pseudo-element. (168875614) Fixed percentage padding in table cells to resolve against column widths. (168940907) Fixed a regression where hovering over elements could leave repaint artifacts on the page. (169112402) Fixed table height distribution to apply to tbody sections instead of only the first section. (169154677) Fixed an issue where table sections with explicit heights did not properly constrain and distribute space among contained rows. (169235210) Fixed an issue where images with min-width: fit-content rendered at an incorrect width. (169359566) Fixed an issue where height: 100% was incorrectly calculated for replaced elements like images serving as grid items nested inside a flexbox. (169431440) Fixed an issue where images were incorrectly stretched in certain page layouts. (170270187) Fixed an issue where Find in Page scrolled to the wrong location when matching text inside elements with user-select: none. (170477571) Fixed the baseline calculation for inline-block elements so that when overflow is not visible, the baseline is correctly set to the bottom margin edge. (170575015) Fixed an issue where replaced elements did not correctly apply min-height and min-width constraints in certain configurations. (170765025) Fixed an issue where overlay backgrounds would briefly dim incorrectly when de-compositing in a scrollable container. (171024685) Fixed a regression where sticky-positioned elements inside overflow containers could appear in front of content that should overlap them. (171179878) Fixed an issue where auto table layout did not honor max-width on table cells when distributing width between them. (171459245) Fixed an issue where border-spacing incorrectly included collapsed columns in auto table layout calculations. (171468102) Fixed an issue where percentage-height children of table cells with unresolvable percentage heights were not sized intrinsically. (171469500) Fixed an issue where cell backgrounds in collapsed-border tables extended into adjacent cells’ border space at table edges. (172068907) Fixed an issue where if a document in an iframe uses @prefers-color-scheme, it does not follow the color-scheme set by grandparents of the iframe. (172229372) Fixed an issue where list item margins were computed incorrectly when the page was zoomed in or out. (172312498) Fixed an issue where about:blank iframes did not always have a transparent background. (172400258) Fixed an issue where a right-floated table could overlap another table. (172655655) Fixed an issue where grid containers failed to avoid float boxes. (172655720) Fixed an issue where an anonymous block created for list markers was not properly collapsed when block content prevented line-box parenting. (172686060) Fixed an issue where checkboxes could overlap with adjacent text. (172741572) Fixed an issue where checkbox outlines appeared misaligned. (172742551) Fixed an issue where list markers rendered on the wrong line when list items started with empty inline elements. (172762578) Fixed an issue where U+2029 PARAGRAPH SEPARATOR was not treated as a forced line break. (173106856) Fixed an issue where tiles were missing after navigating back in history. (173288233) Fixed an issue where view transition snapshots could capture stale transform values for accelerated CSS transform animations. (173323193) Fixed an issue with outside list markers when blockification prevents line-box parenting. (173417560) Fixed a regression where nested empty inline boxes accumulated an incorrect vertical offset, causing inline elements to stack as block-level elements. (173723162) Fixed an issue where pseudo-elements were incorrectly included in outline rect collection. (174033087) Fixed an inverted Y-axis comparison that could cause incorrect caret positioning. (174144220) Fixed an issue where <br> elements with line-height: 0 still created extra vertical space, failing to respect the declared line height. (174400946) Fixed auto outlines to more closely follow the border radii of elements. (174466854) Fixed how gradients are renderer to improve performance. (174880197) Fixed image-orientation being ignored for background-image, border-image, and list-style-image. (174894122) Fixed a white-space: pre-wrap layout issue with justified text. (174937310) Fixed an image with min-height: min-content inside a column flex container not shrinking to preserve its aspect ratio. (174999995) Fixed an issue with flex-wrap and flex factor computation for wrapping flex items. (175012395) Fixed vertical writing-mode content incorrectly wrapping when the parent has auto height. (175123356) Fixed a column-wrap flex container with flex-basis: 0 wrapping items into extra columns instead of stacking them when nested inside another column flex container. (175195518) Fixed incorrect bounding box position for newline characters. (175243361) Fixed an issue where a child element with filter: blur() ignored border-radius overflow clipping from its parent. (175519148) Fixed an issue where absolutely positioned tables with content exceeding their declared width were incorrectly positioned. (175755871) Fixed height calculations for absolutely positioned tables with percentage-sized children. (175762381) Fixed an issue where containers with block-in-inline content did not expand when max-height was removed. (175799547) Fixed an issue where absolutely positioned tables with explicit percentage or fixed heights did not resolve correctly against their containing block. (175852400) Fixed always-on scrollbar thumbs not rendering on the root element of nested documents with display: flex. (175866046) Fixed absolutely positioned tables ignoring min-height and shrinking below their content height. (175883577) Fixed drop-shadow filters and transform: translate() incorrectly clipping nested elements after a regression. (175905543) Fixed absolutely positioned tables ignoring max-height constraints. (175932457) Fixed scrollbar-gutter placement on the root element in RTL layouts. (175939512) Fixed an issue where a flex item with aspect-ratio and content-box padding computed the wrong height in a column flex container. (176033726) Fixed a repaint issue where table rows did not repaint their previous position after a preceding row changed size, causing content to appear at both the old and new locations. (176172404) Fixed an issue where block-level boxes nested within inline elements were not properly aligned when using align-content: center. (176173122) Fixed intrinsic sizing for non-replaced elements with percentage dimensions. (176493856) SVG New Features Added support for the lang and xml:lang attribute in SVG. (143751056) Resolved Issues Fixed an issue where backslash-escaped dot characters in SVG animation timing attribute ID references were not parsed correctly. (94260935) Fixed an issue where SMIL animations of href or xlink:href on SVG <image> elements had no visual effect. (96316808) Fixed an issue where SVG animation did not clear the animated CSS property when attributeName was dynamically changed. (97097883) Fixed :visited link color to properly propagate to SVG through currentColor. (98776770) Fixed an issue where a CSS filter referencing an SVG filter via url(#id) was not invalidated when the filter content changed. (101870430) Fixed negative stroke-dashoffset values rendering with incorrect offsets when stroke-dasharray has an odd number of values. (103596361) Fixed SVG2 systemLanguage attribute to improve parsing and compliance with the specification. (116427520) Fixed removing an item from SVGTransformList to properly allow attribute removal. (117840533) Fixed an issue where the XML document parser did not defer inline script execution until pending stylesheets had loaded. (122574381) Fixed an issue where animated SVG images referenced via an <img> tag did not animate correctly due to repaint artifacts with object-fit. (141815698) Fixed an SVG <tspan> positioning bug with xml:space="preserve" that caused multi-line text to render incorrectly. (143722975) Fixed an issue where SVG elements referencing non-existent filter IDs were not rendered. (164046592) Fixed offsetX and offsetY for SVG elements to use the outermost SVG as the base for coordinate calculation. (168548585) Fixed an issue where URL fragments were not percent-decoded before being used for SVG references. (169582378) Fixed: Updated the default values of fx and fy attributes on SVGRadialGradientElement to 50% to align with the SVG2 specification. (169645572) Fixed SVGAnimatedRect.baseVal to ignore invalid values set on the viewBox attribute, such as negative width or height, aligning with Firefox and Chrome. (170214971) Fixed SVG length attributes to reset to their default values when removed, rather than retaining previously set values. (170360351) Fixed an issue where getScreenCTM() did not include CSS transforms and zoom contributions in the legacy SVG rendering path. (171525696) Fixed an issue where an SVG <image> element was not repainted when the href attribute was removed. (172530834) Fixed an issue where an invalid attribute type in one SVG animation group prevented all subsequent animation groups from running. (172593109) Fixed a regression where wheel events were not dispatched to an empty <svg> root element. (172909441) Fixed an issue where SMIL parseClockValue did not reject out-of-range minutes and seconds values per the SMIL timing specification. (173577212) Fixed the SMIL values attribute to preserve empty values and handle trailing semicolons. (173594455) Fixed SMIL repeat(n) event conditions not triggering animations. (173599629) Fixed SVG2 getStartPositionOfChar and getEndPositionOfChar to be more compliant with the specification. (174145885) Fixed glyph-orientation-vertical: auto to use UTR#50 Vertical Orientation properties for correct character orientation in vertical text. (175064567) Fixed SVG intrinsic aspect ratio being incorrectly suppressed when preserveAspectRatio is set to none. (175173375) Fixed SVG images without complete intrinsic dimensions incorrectly using ratio-based scaling for background-size. (175345107) Fixed the SMIL clock value parser to accept hours greater than 99 and reject malformed seconds values. (175593583) Fixed stroke-dasharray interpolation to use least common multiple for list length matching and corrected composition behavior. (175598175) Fixed an issue where @prefers-color-scheme in an SVG image will sometimes not follow the system color appearance. (176413340) Fixed getScreenCTM() returning an incorrect matrix when the document is scrolled under a CSS-transformed ancestor. (176814876) Deprecations Removed the SVGLocatable and SVGTransformable interfaces to align with the SVG2 specification. (104668934) Removed the non-standard nearestViewportElement and farthestViewportElement properties from SVGGraphicsElement, aligning with the SVG2 specification. (171262197) Removed the viewTarget property from SVGViewSpec to align with the SVG2 specification. (172590438) Scrolling New Features Enabled scroll anchoring, which prevents visible jumps in scroll position when content is inserted or removed above the viewport. (171840378) Resolved Issues Fixed an issue on iOS where calling scrollTo during a momentum scroll incorrectly interrupted the scroll, ensuring that momentum scrolling continues as expected and smooth scrolling behaves properly. (41949531) Fixed an issue on iOS where programmatic smooth scrolling with scroll-snap-type: mandatory failed after the browser chrome was hidden. (100727098) Fixed an issue where interrupting scroll momentum caused the scrolling container to stop rendering and hit-testing to be misplaced. (116205365) Fixed an issue on iOS where restored scroll position was incorrect after relaunching Safari. (127308062) Fixed an issue where tabbing in a scroll container with scroll-padding did not scroll the focused element into view. (147513379) Fixed an issue on macOS where custom CSS scrollbars could be cut off and the scrollbar corner rect was sized incorrectly. (168566468) Fixed rubberbanding behaving incorrectly when a site triggers a smooth scroll to the top during a rubberband. (170705188) Fixed an issue where pages could become blank and jump to the top after dynamically loading new content when scroll anchoring was enabled. (170889205) Fixed an issue where scroll anchoring could cause pages to scroll to negative offsets. (171221075) Fixed an issue where pages using the Navigation API could have offset hit test locations, making elements unclickable. (171752650) Fixed an issue on iOS where composited layers would briefly flash blank when window.scrollTo() was called synchronously with a DOM layout change. (173197381) Fixed an issue where sticky-positioned elements could flicker rapidly after scrolling. (173680821) Fixed an issue where scroll anchoring could cause a page to scroll to the top or bottom automatically. (173885027) Fixed an issue where calling scrollIntoView() on a scrollable element incorrectly scrolled the element’s own contents. (174173683) Fixed scroll anchoring interfering with rubberbanding on some websites. (175195943) Fixed an issue on iOS where scroll position was not preserved correctly when rotating the device on right-to-left pages. (175910769) Spatial Web New Features Added support for the <model> element on iOS, iPadOS, and macOS.  (131735906) Added support for the <img> controls attribute on spatial and panorama photos. (138146584) Added support for immersive website environments in visionOS. (169967223) Added support for dynamic-range-limit on the <model> element. (174775575) Added support for tone mapping in the <model> element. (175889208) Resolved Issues Fixed spatial and panoramic image controls to support RTL language layout and localization of type labels. (161690817) Fixed <model> elements displaying at 100x the expected size for assets authored in tools that use centimeter units. (167805672) Fixed an issue where WebXR viewports did not get an initial value until getViewport() was called. (168125694) Fixed an issue where the <model> element stagemode orbit physics behaved differently between iOS and visionOS. (172189776) Fixed an issue on visionOS where fullscreen video would sometimes jump when exiting fullscreen if the browser window was narrower than the video. (174454557) Fixed an issue where removing all text from the URL bar on Safari in visionOS showed an empty completion list.  (176499710) Known Issues WebXR might not render when you use Simulator. Workaround: Use an Apple Vision Pro device instead of Simulator. Storage New Features Added support for setting maxAge in the Cookie Store API via cookieStore.set(). (166301541) Resolved Issues Fixed an issue where IndexedDB could incorrectly return a version 0 database after an abort during the initial onupgradeneeded event. (176195526) Tables Resolved Issues Fixed an issue with a collapsed border color mismatch when the table cell has a different writing-mode. (173655092) Web API New Features Added support for the service worker static routing API.  (157951894) Added support for async iteration over ReadableStream objects using for await...of loops. (168049382) Added srgb-linear and display-p3-linear to PredefinedColorSpace. (169340732) Added support for ReadableStream.from() to create a ReadableStream from an async iterable or iterable. (169605740) Added support for transferring ReadableStream objects via postMessage(). (169950592) Resolved Issues Fixed the parent window’s history.state being set to null when history.pushState is called from a child iframe. (50019069) Fixed clicking on a scrollbar of an overflow container blurring the current activeElement. (92367314) Fixed an issue where the change event was not fired on <input> and <textarea> elements when they lost focus while another application was in the foreground. (98526540) Fixed Web IDL bindings to correctly reject SharedArrayBuffer where [AllowShared] is not specified. (107786134) Fixed Content Security Policy to only recognize ASCII whitespace excluding vertical tabs to align with the specification. (108559413) Fixed emoji input on Google Docs and similar web applications by supressing keypress events for supplementary characters. (122678873) Fixed an issue where MouseEvent.offsetX and MouseEvent.offsetY were not relative to the padding edge as specified. (125763807) Fixed an issue on visionOS where the gamepadconnected event did not fire unless gamepad permission had already been granted. (141623162) Fixed an issue where CSPViolationReportBody did not include the source line number in Content Security Policy violation reports. (152607402) Fixed an issue where selecting credentials in the Digital Credentials API sometimes required a second click to trigger verification. (163295172) Fixed window bar visibility properties (toolbar.visible, statusbar.visible, menubar.visible) to return static values per the HTML specification for privacy and interoperability. (166554327) Fixed handling of unknown DigitalCredential protocols by gracefully filtering them out and showing a console warning instead of throwing an error. (166673454) Fixed: Updated the Digital Credentials API to rename DigitalCredentialRequest to DigitalCredentialGetRequest per the latest specification. (167115220) Fixed an issue where Service Worker routes were not matched when no fetch event handler was set. (167753466) Fixed spec conformance issues in the Streams API piping and abort behavior. (167841090) Fixed Service Worker static routing rules to enforce limitation checks as required by the specification. (167977145) Fixed layerX and layerY to return correct values with CSS transforms. (168968832) Fixed location.ancestorOrigins returning stale origins after an iframe is removed from the document. (169097730) Fixed NavigateEvent.canIntercept to correctly return false when navigating to a URL with a different port, aligning with the Navigation API specification. (169845691) Fixed NavigateEvent.navigationType to return "replace" when navigating to a URL that matches the active document’s URL. (169999046) Fixed an issue where the dragend event had incorrect coordinates when dragging within a nested <iframe>. (170750013) Fixed an issue where navigation.currentEntry.key did not change in private browsing windows after calling history.pushState(). (171147417) Fixed an issue where touch event properties values were sometimes swapped with neighboring values. (171567543) Fixed a performance issue where ResizeObserver callbacks became increasingly sluggish over time. (172718139) Fixed a performance issue where IntersectionObserver became sluggish over time when observing many elements due to O(n²) iteration. (172727210) Fixed an issue where navigation.currentEntry.id did not change in private browsing windows after calling history.replaceState(). (172897962) Fixed an issue where document.open() incorrectly aliased the caller’s security origin. (173369038) Fixed an issue where history.replaceState() on a traversed history entry incorrectly changed navigation.currentEntry.key to a new UUID instead of preserving the original key. (173388766) Fixed an issue where Object.prototype could not be serialized by structuredClone(). (173728983) Fixed an issue where backslashes were not handled correctly in non-special URLs. (173757759) Fixed a URL parsing bug in the special relative or authority state. (173772241) Fixed an issue where event listener once and passive flags were not preserved when copying listeners between elements. (173834642) Fixed: Preserved existing listener options (such as passive defaulting) when overwriting event handler attributes. (173842822) Fixed the Credential Management API to properly define which credential types are allowed in the same get() request. (173918198) Fixed an issue where event.target was not set after dispatching an event in a shadow tree with no listeners. (174136382) Fixed an issue where navigator.credentials.create() and navigator.credentials.get() discarded the AbortSignal reason and always rejected with a generic AbortError. (174220589) Fixed Range.extractContents() to not extract out-of-bounds nodes when the end container is removed during extraction. (174307275) Fixed document.createEvent() to throw an exception for "MutationEvents", "MutationEvent", "PopStateEvent", and "WheelEvent", aligning with other browser engines. (174339775) Fixed ParentNode.append() to correctly de-duplicate nodes when the same node is passed multiple times. (174365465) Fixed an issue where MutationObserver delivered childList records in the wrong order when script ran during node insertion. (174368989) Fixed an issue where setting a URL object’s port property to whitespace behaved incorrectly. (174484035) Fixed a missing return in the Navigation API’s performTraversal that caused incorrect behavior when traversing to an unknown key. (174513305) Fixed Blob.slice() to correctly clamp fractional start and end parameters using round-half-to-even rounding per the File API specification, which may change how edge-case fractional values like 0.5 are rounded. (174555334) Fixed postMessage() to validate transferable object states after serialization, aligning with the HTML specification. (174558047) Fixed structuredClone() and window.postMessage() to correctly throw a DataCloneError when serializing a SharedArrayBuffer outside of cross-origin isolated contexts. (174562553) Fixed an issue where calling Element.blur() on an <iframe> did not reset document.activeElement to <body>. (174591529) Fixed document.styleSheets to be accessible on documents created by DOMParser. (174625774) Fixed innerText getter to correctly handle trailing newlines and blank lines for <p> elements and headings. (174642704) Fixed innerText whitespace handling at inline-block boundaries. (174713114) Fixed XMLSerializer namespace handling to correctly serialize elements with namespace prefixes. (174726401) Fixed the innerText getter to preserve newlines for elements with white-space: pre-line. (174727341) Fixed service worker registrations to be unregistered when the main script is missing. (174755909) Fixed innerText handling of replaced elements at block boundaries. (174816319) Fixed EventSource to be closed when window.stop() is called. (174830925) Fixed service worker registrations to be unregistered when failing to retrieve stored imported scripts. (174833692) Fixed calling preventDefault() during a pointerdown event to correctly suppress mousedown and mouseup events on iOS. (174864309) Fixed innerText to not fall back to textContent for elements with display: contents. (174883499) Fixed innerText to preserve the contents of <option> elements inside <select>. (175006854) Fixed Element.innerText to collect option text when called directly on a <select> element. (175156630) Fixed worker scripts to always be decoded as UTF-8, as per the specification. (175327455) Fixed an issue where an Event object’s target property could lose its JavaScript wrapper due to premature garbage collection. (175439759) Fixed an issue where ancestors of TreeWalker.currentNode could be prematurely garbage collected. (175442228) Fixed FileSystemDirectoryHandle.resolve() to return the correct path array for child entries. (175645387) Fixed PerformanceNavigationTiming.domInteractive and domContentLoadedEventEnd incorrectly returning 0 instead of the correct timestamps. (175739835) Fixed FileSystemDirectoryHandle.removeEntry() to correctly remove entries. (175745157) Fixed CryptoKey to correctly remain associated with its secure context. (176157712) Fixed: Improved cross-origin isolation enforcement for workers. (176175488) Fixed SharedArrayBuffer cloning and agent cluster ID assignment. (176465817) Fixed missing custom element callbacks for the role attribute. (176713992) Fixed incorrect URL parser invocation on the Notification object. (176762955) Fixed requestAnimationFrame() not providing sub-millisecond timestamp precision in cross-origin isolated contexts. (176967366) Web Extensions New Features Added support for runtime.getDocumentId() web extension API. (168060269) Added reporting of uncaught JavaScript exceptions and unhandled promise rejections in Web Extension scripts. (174354070) Added support for propagating user gestures through sendMessage(), connect(), postMessage(), and executeScript() APIs, enabling extensions to perform gesture-requiring actions like media playback. (175797617) Resolved Issues Fixed cross-origin XMLHttpRequest incorrectly triggering additional Web Extension permission requests. (154866064) Fixed browser.i18n.getMessage() to correctly substitute named placeholders when they appear adjacent to non-space characters. (169146196) Fixed browser.i18n.getMessage() to correctly substitute two adjacent named placeholders. (175315700) Fixed an issue where web extension service worker registration database files accumulated on each Safari launch, causing performance degradation. (175484888) Fixed loading Web Extensions breaking Cloudflare bot challenge pages. (176618014) Web Inspector New Features Added color contrast information within the Color Picker in Web Inspector. (113887185) Added support to show each individual request when there are redirects in the Network tab. (152606018) Improved discoverability of color formats and gamuts in the color picker by adding explicit format and gamut toggle controls. (168216591) Added support for showing contrast information in the Color Picker when editing background color properties. (171332734) Added Subgrid and Grid-Lanes badges to the Elements tab for easier identification of subgrid and grid-lanes layout contexts. (173681497) Added the layout root element to Layout event details in the Timeline tab. (175419350) Added unique colors for style events such as “Style Invalidated” and “Style Recalculated” in the Timeline view to distinguish them from layout events. (176770197) Resolved Issues Fixed an issue where CSS properties added to new rules were not applied and were marked as invalid. (103548968) Fixed an issue in the Network panel where the Request / Response menu did not remember the user’s previously selected value. (108231795) Fixed editing inline style attribute values in the Elements panel resulting in truncated or malformed content. (149523483) Fixed an issue where the input field for recording canvas frames in the Graphics tab was sometimes too small to type in and only allowed typing one character at a time. (157787230) Fixed the Network tab filtering by resource type not working after clearing a filter that had no matches. (161570940) Fixed an issue where CSS rules added via the “Add New Rule” button in the Styles panel were intermittently not applied or would vanish after entering a property. (164971557) Fixed an issue where tree outlines in Web Inspector would intermittently show blank content while scrolling when a filter was active. (169502061) Fixed an issue where an active  recording in the Timelines tab would stop when navigating or reloading the current page even when the setting to stop recording once the page loads was turned off. (169732727) Fixed an issue in the Timelines tab where rows containing object previews were sometimes not visible in the heap snapshot data grid. (170164522) Fixed context menu items in the Elements tab to only display relevant options when multiple DOM nodes are selected. (170307979) Fixed an issue where previewing resources in the Network tab displayed an error upon navigating away and Preserve Log was enabled. (171216835) Fixed an issue where selected DOM node keys in a Map in the Scope Chain sidebar had unreadable white text on a light background. (171840122) Fixed the Safari Develop menu and WebDriver to launch Device Hub instead of Simulator when available in Xcode.  (174276041) Fixed the Layers 3D view to correctly map textures to composited bounds and use proper selection highlighting instead of tinting textures. (174355052) Fixed the Layers 3D view to re-snapshot preserved layers after a repaint instead of displaying stale textures. (174358757) Fixed an issue where the WebAssembly debugger had no source bytes for modules compiled via WebAssembly.instantiateStreaming, preventing source-level debugging in LLDB. (174362152) Fixed the WebAssembly debugger to generate human-readable module names from the WebAssembly name section and fetch URL, replacing bare address-based fallback names in LLDB’s image list. (174465437) Fixed an issue where all folder tree elements were expanded after filtering for a resource in the Sources panel. (175009135) Fixed an erroneous “There are unread messages that have been filtered” banner appearing in the Console when console.groupCollapsed() is used. (175279759) Fixed an issue in the Storage tab where filtering by storage type did not reveal the popup with options. (175444192) Fixed Timeline recordings showing unrelated events incorrectly nested inside longer events. (176309164) Fixed Web Inspector toolbar buttons rendering at incorrect sizes. (176508343) Fixed an issue in the Styles tab where style editing would be interrupted if a new style suddently matched. (178053421) Web Views New Features Added WKSerializedNode as a public API, enabling applications to clone DOM nodes including shadow roots between different WKWebView instances. (166552298) Added WKJSHandle as a public API, enabling applications to create and manipulate JavaScript object references across content worlds. (166552556) Added WKContentWorldConfiguration as a public API for configuring content world properties such as autofill scripting, shadow root access, and inspectability when creating a WKContentWorld. (166553118) Added alternateRequest and overrideReferrerForAllRequests properties to WKWebpagePreferences as public API, allowing applications to modify the main resource request during navigation and apply custom referrer headers across all resource loads. (166555923) Added a willSubmitForm callback to WKNavigationDelegate with a new WKFormInfo object, enabling applications to be notified of and respond to HTML form submissions.  (166556756) Added mainFrameNavigation to WKNavigationAction and navigation to WKNavigationResponse as public API, allowing applications to reliably correlate navigation actions and responses with their originating loads. (167445147) Added loadURL: to WKWebView as a convenience method for loading a URL directly without wrapping it in an NSURLRequest. (167445337) Added getCookiesForURL: to WKHTTPCookieStore as public API, allowing applications to efficiently retrieve cookies matching a specific URL instead of fetching the entire cookie store. (168165666) Added the ability to clear a content world via WKWebView. (176381093) WebAssembly New Features Added support for WebAssembly JavaScript Promise Integration (JSPI). (170260385) Resolved Issues Fixed WebAssembly.Suspending and WebAssembly.SuspendError to be data properties instead of getter functions, aligning with other WebAssembly attributes like WebAssembly.Module. (170155726) Fixed incorrect IntegerOverflow exceptions thrown by i32.rem_s, i64.rem_s, i32.div_u, i64.div_u, i32.rem_u, and i64.rem_u when both operands are constants. (175122462) Fixed a regression where RegisterSet::normalizeWidths() lost vector-width information, causing v128 argument corruption in WebAssembly SIMD thunks. (176035764) WebGL Resolved Issues Fixed compressedTexImage not validating whether the compressed texture format extension has been enabled. (175652171) Fixed some texImage functions reporting errors with incorrect function names. (175652807) Fixed some WebGL context state properties not being correctly reset on context loss. (176190808) WebGPU New Features Added support for the clip_distances builtin value in WGSL shaders. (129202606) Resolved Issues Fixed GPUDevice.onuncapturederror event handler attribute not working. (149577124) Fixed: Restored maxStorageBuffersInFragmentStage and related WebGPU limits. (160800947) Fixed rendering failing when using direct GPUTexture objects instead of GPUTextureView with multisampled resolve targets in render passes. (175452924) Fixed a WGSL shader validation failure in binary arithmetic expressions. (176473479) WebRTC New Features Added support for the targetLatency attribute in WebRTC. (168225793) Added support for the RTCRtpCodec dictionary and related constructs. (172745579) Added support for RTCRtpReceiver.jitterBufferTarget. (173676035) Added support for video source width and height in RTC stats. (173677615) Resolved Issues Fixed an issue where I420 BT709 VideoFrame was encoded in an incorrect color space when encoding to VP9. (169425608) Fixed an issue where RTCPeerConnection.addIceCandidate() did not reject when the connection was already closed. (170470988) Fixed outgoing video feeds freezing when the Safari window is obscured by another window while a virtual background is active. (170720729) Fixed an issue where RTCDataChannel did not check the SCTP buffered amount synchronously. (172386678) Fixed an issue where MediaStreamTrack could have incorrect settings if the source settings changed while the track was being transferred. (172657570) Fixed an issue where a remote WebRTC track was not unmuted when the first packet was received. (172904930) Fixed validation of RTC send encodings to better align with the specification. (172997814) Fixed an issue where RTCRtpSender.setParameters did not clear parameters that were unset by the web application. (173678165) Fixed WebRTC VP9 encoders to correctly propagate frame colorspace information. (174008548) Fixed a regression where RTCPeerConnection with iceTransportPolicy: "relay" failed to gather ICE candidates. (174794660) Fixed RTCInboundRtpStreamStats.trackIdentifier to match MediaStreamTrack.id. (174938984) Fixed screen sharing via getDisplayMedia() starting at extremely low quality and taking up to 30 seconds to become legible for remote participants. (175425085)