---
title: Safari 18.4 Release Notes
framework: safari-release-notes
role: article
role_heading: Article
path: safari-release-notes/safari-18_4-release-notes
---

# Safari 18.4 Release Notes

Released March 31, 2025 — 18.4 (20621.1.15)

## Overview

Overview Safari 18.4 is available for iOS 18.4, iPadOS 18.4, visionOS 2.4, macOS 15.4, macOS Sonoma, and macOS Ventura. Authentication New Features Added support for setting a pin on a security key when a registration requires it.  (122660610) Browser Resolved Issues Fixed an issue where sites would log out automatically after a brief time.  (99829958) Canvas New Features Added CanvasRenderingContext2D support for unprefixed letterSpacing and wordSpacing.  (140614722) Deprecations Removed support for webKitBackingStorePixelRatio.  (123980544) Removed support for the prefixed webkitImageSmoothingEnabled to use the standard imageSmoothingEnabled property.  (141128458) Removed non-standard legacy alias of Canvas Compositing including setAlpha and setCompositeOperation.  (141510218) Connection Security New Features Added the ability to view certificate detail from Page Menu > more > Connection Security Details on iOS, iPadOS, and in visionOS, or Safari > Connection Security Details… on macOS.  (139300381) Deprecations Removed the lock icon from the Smart Search field for HTTPS connection. (107993392)  (107993392) CSS New Features Added support for writing-mode: sideways-rl and writing-mode: sideways-lr.  (81519211) Added support for the ::details-content pseudo-element.  (129786929) Added attr() fallback support.  (136763160) Added support for view-transition-name: match-element.  (138932551) Added support for text-autospace.  (140008990) Added support for the CSS shape() function.  (142276582) Added support for gradients with only one stop.  (142796999) Resolved Issues Fixed table border-color to be currentColor by default.  (48382483) Fixed combining CSS clip-path with any property that creates a new stacking context makes <img> element disappear.  (86091397) Fixed resize to not be applied to generated content.  (121348638) Fixed contain: size breaking object-fit.  (131866042) Fixed: Dropped layout containment from container-type.  (132549134) Fixed handling all of the CSS properties in specifications that should cause a UI widget to devolve to a primitive appearance.  (134273374) Fixed scrollIntoView alignment to always be honored.  (135484284) Fixed:background-clip: border-area to do nothing on the root.  (135972986) Fixed vertical-rl writing mode inter-character ruby text being significantly smaller than over ruby text.  (135973587) Fixed CSS cursor to not eagerly evaluate calc() values.  (136103471) Fixed flex shorthand to not eagerly evaluate calc().  (136103475) Fixed -webkit-perspective to not eagerly evaluate calc().  (136103493) Fixed @property initial-value descriptor to prevent containing var(--foo).  (136103499) Fixed delaying the evaluation of calc() for raw font consumers so that each caller can choose the correct behavior.  (136103500) Fixed grid to not eagerly evaluate calc() for repetitions value.  (136103503) Fixed counter-increment, counter-set, and counter-reset to not eagerly evaluate calc().  (136103519) Fixed CSS nested declarations inside a @scope to behave like :where(:scope).  (136856371) Fixed: Updated the shape() function to match the proposed syntax.  (138126105) Fixed same-document view transitions performance on pages with many elements.  (138966650) Fixed an issue where radial gradients with two color stops at 100% failed to extend the last color.  (139369366) Fixed @scope start and end to be a classic (non-forgiving) selector list.  (139471866) Fixed updating the base background color where the root has color set explicitly when switching to light or dark modes.  (139917332) Fixed performance of querySelectorAll() with :has() descendant selectors.  (140093151) Fixed the unicode-bidi default for the <bdo> element.  (140662417) Fixed broken revert-layer when logical group CSS properties are explicitly inherited.  (140819138) Fixed border-spacing to use the shortest possible serialization (“0px” vs “0px 0px”).  (141920587) Fixed subsequent nested styles getting ignored after an incorrect nested selector.  (142187930) Fixed font-variant-caps: all-small-caps causing incorrect box-sizing in flex inline context.  (142212550) Fixed ensuring  the correct logic is run for over-constrained cases when the absolute positioned box is a writing-mode root.  (142214631) Fixed animation-name set from the view transitions dynamic UA stylesheet having extra quotes.  (142298840) Fixed the serialization and parsing of animation-name strings.  (142318879) Fixed text-box-trim accumulation failing when updating the CSS dynamically.  (142386761) Fixed text-emphasis to not paint emphasis marks on punctuations.  (142387538) Fixed sizing and positioning issues when a popover changes CSS position upon opening.  (142491219) Fixed Page Zoom (⌘+ and ⌘-) to work with calc() used with font-size on macOS.  (142736427) (FB16287129) Fixed scroll-padding and scroll-margin to be strongly typed CSS/Style values.  (142830546) Fixed View Transitions to stop running when the user navigates with a swipe.  (142844150) Fixed top-level and nesting selector to have zero specificity matching a recent specification update.  (143765827) Deprecations Removed the non-standard CSSUnknownRule interface.  (142380626) Editing New Features Implemented ClipboardItem.support() which gives the page author the ability to understand which formats are supported during Clipboard operations. It also now returns a TypeError for a new ClipboardItem() with an empty Array.  (136008522) Resolved Issues Fixed document.execCommand("copy") only triggering if there is a selection.  (27792460) Fixed an issue where iCloud Notes pasted text copied from a plain text document in Safari as raw markup.  (124788252) Fixed highlighting correctly a large text selection that ends with a common phrase.  (135973065) Fixed copying a link to a common term in an article to highlight the correct part of the page.  (135973186) Fixed missing SecureContext in the ClipboardItem interface.  (137197266) Fixed Hebrew text pasted from Safari getting aligned left.  (139029945) Fixed setting selection to not set focus unless there is an existing selection.  (139075809) Fixed sometimes being unable to select text for non-editable content.  (143296175) Fixed missing selection handles after selecting text across multiple lines.  (143720155) Forms New Features Improved <input type="file" webkitdirectory> support on iOS.  (125457578) Added alpha and colorspace attributes to <input type=color>.  (137737348) Resolved Issues Fixed <textarea> to handle switching direction.  (73475239) Fixed setting a datetime-local input to a large value cause a crash.  (135733092) Fixed <datalist> dropdown keyboard interactions to align with platform conventions.  (143012287) Fixed: Disabled all Writing Tools app menu items, except “Compose”, for empty editable content.  (143332082) Home Screen Web Apps Resolved Issues Fixed Wake Lock API for Home Screen Web Apps.  (108573133) HTML New Features Implemented <details> and <summary> disclosure triangle as a list item.  (95148788) Deprecations Removed the composite attribute on an <img> element.  (143109250) Images Resolved Issues Fixed broken WebP images in lockdown mode.  (144224372) JavaScript New Features Completed the Iterator Helpers proposal by implementing map(), filter(), take(), drop(), and flatMap() methods.  (103171739) Updated JSON.parse to provide the reviver function access to the input source text and extended JSON.stringify behavior to support object placeholders.  (131579181) Added support for Math.sumPrecise.  (131580043) Added support for Iterator.prototype.toArray from Iterator Helpers Proposal.  (135493558) Added support for Iterator.prototype.forEach from Iterator Helpers Proposal.  (136010225) Added support for some, every, find from Iterator Helpers Proposal.  (136027193) Added support for Iterator.prototype.reduce.  (136064316) Added support for SetterThatIgnoresPrototypeProperties() in Iterator helpers.  (137078675) Added support for Atomics.pause.  (137571229) Added support for Iterator.prototype.chunks and Iterator.prototype.windows.  (138012241) Added support for Iterator.concat.  (138013723) Added support for Iterator Helpers.  (138520150) Added support for Map.prototype.getOrInsert and WeakMap.prototype.getOrInsert.  (138955824) Added support for Error.isError.  (141132351) Added "never" and "formalSymbol" to the currencyDisplay option for Intl.NumberFormat.  (141504278) Resolved Issues Fixed Array destructuring assignment to close the iterator if an evaluation throws an exception.  (121960887) Fixed: Updated Intl.DurationFormat#resolvedOptions to the latest specification.  (136276429) Fixed Iterator Helpers methods to not iterate an array.  (136303997) Fixed Iterator.prototype.reduce() not properly forwarding the return() call to the underlying iterator.  (137181340) Fixed Set.prototype methods to invoke keys() without arguments.  (137395979) Fixed Array.from(), Array.fromAsync(), and TypedArray.from() to invoke document.all passed as a mapper.  (137490201) Fixed Intl.DurationFormat to have a value limit to match the specification.  (137885273) Fixed a rounding error for Intl.DurationFormat.  (138261569) Fixed calendar canonicalization logic in DateTimeFormat.  (141792829) Fixed broken output for Intl.DurationFormat digital style when hoursDisplay is "auto".  (141969050) Fixed Intl.DurationFormat to print a negative sign for minutes after hidden hours.  (142119353) Fixed Array.prototype.toReversed to fill holes with undefined.  (142197604) Fixed: Increased the matchLimit for regular expressions, allowing complex matches on longer strings.  (143202375) Deprecations Removed obsoleted methods for Temporal.PlainTime and Temporal.PlainDateTime to align with specification changes.  (135509670) Loading New Features Added noopener-allow-popups support in Cross-Origin-Opener-Policy.  (129664445) Media New Features Added support for Ogg Opus and Ogg Vorbis on macOS Sequoia 15.4, iOS 18.4, iPadOS 18.4, and visionOS 2.4.  (131407707) Added support for the Image Capture API.  (136860809) Added WebM support to MediaRecorder.  (137560454) Resolved Issues Fixed handling an empty srcAttr in Media Element.  (132042925) Fixed getUserMedia video track getSettings() returning a stale value for torch and whiteBalanceMode constraints.  (137870391) Fixed the space key not pausing a video in fullscreen by making the video mouse focusable.  (138037616) Fixed an issue where playback doesn’t always resume after a seek.  (140097993) Fixed playing video generating non-monotonic ‘timeupdate’ events.  (142275184) (FB16222910) Fixed websites calling play() during a seek() is allowed by the specification so that the play event is fired even if the seek hasn’t completed.  (142517488) Fixed seek not completing for WebM under some circumstances.  (143372794) Fixed MediaRecorderPrivateEncoder writing frames out of order.  (143956063) Networking New Features Added support for Cookies Having Independent Partitioned State (CHIPS).  (116143212) Added support for cookies’ Partitioned attribute for opt-in partitioned cookies.  (142317056) Blocked partitioned cookies for known tracking domains.  (144184516) Resolved Issues Fixed optimistically upgraded navigations to set a timeout based on current network conditions.  (135972599) Deprecations Changed 3DES cipher to show a warning to users that it is a legacy TLS cipher.  (138948491) PDF Resolved Issues Fixed switching a PDF from continuous to discrete mode displaying the page(s) that are at the top of the window, even when barely visible.  (137608841) Fixed the “Previous Page” context menu option not navigating to previous page in 2-up continuous mode.  (139817364) Fixed main frame PDFs served with a CSP sandbox header not loading.  (141166987) Rendering Resolved Issues Fixed computing the baseline for replaced elements with an intrinsic ratio but no intrinsic size as flex items.  (74279029) Fixed flickering caused by extra resize events dispatched when rotating from landscape to portrait on iOS.  (93767145) Fixed adding out-of-flow objects under the inline in a continuation chain, when possible.  (102421379) Fixed mix-blend-mode to work for large resolution fixed or stick elements.  (104686540) Fixed the missing table collapsed border for <thead>, <tbody>, and <tfoot> elements in the wrong order.  (110430887) Fixed handling inline-box trailing content.  (112409103) Fixed <input type="range"> taking up space even with width: 0 applied.  (113402515) Fixed the Spotify media player disappearing when rotating to landscape mode on iOS.  (123870311) Fixed textarea elements to reserve space for overlay scrollbars.  (129597865) Fixed grid layout animation performance by caching intrinsic logical heights during the first row sizing pass, improving efficiency and preventing invalidation issues with complex grid configurations.  (135791322) Fixed Grid item which is an image with specified sizes failing to update when the src changes.  (135972911) Fixed nested inlines’ vertical alignment when line-fit-edge is set.  (136036997) Fixed the consistency of table layout with <td width="100%">.  (136090741) Fixed repainting to be more consistent for text-underline-position.  (136095297) Fixed floats not clearing in the WordPress Classic Editor sidebar layout.  (136362683) Fixed handling of out-of-flow children in MathML layout functions to be consistent.  (136683070) Fixed a repeating background-image sized to the content-box failing to fill the viewport in an iframe.  (136725820) Fixed consistently triggering a reflow when needed for table DOM manipulations.  (137300794) Fixed scriptlevel multipler for font-size in MathML.  (137671252) Fixed inline marquees to allow them to shrink when adjacent to float(s).  (137766071) Fixed a flex container with no flex item to not run flex layout.  (137884128) Fixed support for CSS width and height properties on MathML elements.  (138174295) Fixed Inline content incorrectly positioning around right-to-left and/or vertical shape-outside floats.  (139076129) Fixed incorrectly overlapping when a float has shape-outside: inset.  (139133291) Fixed right-to-left content failing with a shape-outside float.  (139198865) Fixed incorrectly overlapping a float that has shape-outside: ellipse in vertical mode.  (139208636) Fixed incorrectly overlapping a float that has shape-outside: polygon in right-to-left.  (139215719) Fixed outside list-style-position quirk to only be applicable in quirks mode.  (140602985) Fixed: Updated line box dimensions.  (141167251) Fixed incorrect horizontal writing mode state when nested in a vertical block container.  (141543326) Fixed baseline calculation few cases for tables with empty rows.  (142046863) Fixed to refuse to break inside replaced content.  (142224455) Fixed absolute positioned child with percent to include containing block padding.  (142321535) Fixed computing an out-of-flow box width correctly when it is inside an inline continuation.  (142417374) Fixed a border not showing when a linear gradient and a border radius are set.  (142617573) Fixed relative-positioned input elements in scroll areas not rendering outlines.  (142995142) Fixed tabbing out of a popover causing a hang in certain cases.  (143145544) Fixed setting up inline continuations correctly when not inserting a new child.  (143388080) Fixed adding a margin-top to a <rt> also adds a bottom margin.  (143720832) Scrolling New Features Added support for Scroll To Text Fragment feature detection with document.fragmentDirective.  (139631353) Resolved Issues Fixed changes to the “scrolling” attribute on an iframe element already in the DOM to take effect.  (98911472) Security New Features Added support for CSP Hash Reporting keywords: report-sha256, report-sha384, and report-sha512.  (142458671) Deprecations Removed support for Clear-Site-Data: * for executionContexts as Safari was the only browser to ship it.  (120821984) Service Workers Resolved Issues Fixed handling the case of busy looping service workers in a process containing web pages.  (138626537) Fixed an unexpected failure when serving a redirected response from cache for a navigation loaded via service worker navigation preload.  (146113615) Spatial Web New Features Added support behind a feature flag for the controls attribute on <img> elements for spatial images in visionOS.  (129784451) Added support for Writing Tools in visionOS.  (135210076) Storage New Features Added support for partitioned cookies in Clear-Site-Data: Cookies.  (140403030) Resolved Issues Fixed the Storage Access API to consider AllExceptPartitioned as not currently having cookie access, ensuring sites can request access to first-party cookie.  (143508260) SVG New Features Added support for SVGImageElement.prototype.decode().  (135404215) Added support for the lh length type.  (142068343) Added support for the ch length type for character width, but does not include support for upright vertical character width.  (142463263) Resolved Issues Fixed not propagating the bounding box for empty text to ancestors.  (115217040) Fixed SVG masks not working as a mask-image.  (127327715) Fixed a bug in case of reference elements (e.g., textPath) unable to notify the referring element (e.g, text) about their availability.  (135509733) Fixed SVGUseElement to prevent sniffing the content type when loading an external document.  (135972621) Fixed vertical writing modes to se the correct bounding rect.  (135973175) Fixed: Updated getTotalLength() with the web specification to throw an exception when non-renderable and the path is empty.  (136719548) Fixed SVG quadratic curve getting incorrectly clipped at tile boundaries.  (139904014) Fixed dynamically updating the transform attribute.  (140761655) Fixed synthesizing a viewBox in <img> only for the document element <svg>.  (141733733) Fixed SVGElement.prototype.ownerSVGElement on the outermost <svg> in foreignObject.  (143625675) Deprecations Removed the SVG 1.1 kerning property.  (116965514) Removed SVGDocument alias to XMLDocument.  (123121696) Tables Resolved Issues Fixed table row direction to be determined by the table’s direction, not the section.  (99343532) Fixed missing behavior for rowspan="0" on HTML tables where 0 means span over all the remaining rows.  (133910430) Fixed Table Root to also account for fill-available in a fixed table layout.  (137297914) Fixed table section and row background to not be treated as opaque.  (142588505) Text Resolved Issues Fixed an issue where a thick underline would not show on short content.  (64705955) Fixed: The changes for GB18030-2022 now properly impact GBK as well, as required by the Encoding Standard.  (136368583) Fixed automatically hyphenating text only when a language specified.  (136826305) Fixed the boundary style calculation when text-spacing: text-autospace is applied.  (137153961) Fixed displaying OpenType-SVG color fonts.  (137496217) (FB15426148) Web API New Features Added support for element.focus({ focusVisible: true }).  (97021844) Added support for PublicKeyCredential.toJSON().  (109419228) Added support for the Cookie Store API.  (135969444) Added Key generation, import and export support for CryptoKeyOKP(x25519/ed25519).  (136368298) Added support for Brotli to Compression Streams.  (137244214) Added an option to set the popover’s invoker from an imperative API.  (139362169) Added support for Declarative Web Push.  (141082392) Added support for X25519 for Web Cryptography.  (141346336) Added support for dialog.requestClose().  (143388390) Resolved Issues Fixed: Aligned some MIME type handling in EME with the MIME Sniffing standard.  (114311586) Fixed window.history.replaceState('', '', '') having no effect on macOS.  (117782346) Fixed MutationObserver to observe style attribute changes when resizing the element.  (120109181) Fixed: Updated selectorText handling to align with the specification for CSSPageRule.  (125588212) Fixed Gamepad rumble issue where sending two sequential playEffect() requests prevents reset() from working as expected.  (126589062) (FB13733668) Fixed matching emoji in an element’s id attribute from a <link rel=expect> with an href that uses percent-encoded syntax.  (134531921) Fixed the onrejectionhandled and onunhandledrejection event handler attributes to work correctly on body and frameset elements.  (135401362) Fixed render blocking for <link> to not match elements that are on a ‘stack of open elements’ for the parser.  (135846827) Fixed Distraction Control unexpectedly hiding out-of-flow elements that overlap with a hidden element.  (136358918) Fixed CSSOM setSelectorText(string) to prepend the implicit selector.  (136791222) Fixed HTMLElement.prototype.requestPointerLock to return a Promise.  (139854530) Fixed innerText behavior for <details> and <summary>.  (140172890) Fixed the HTML parser phone number handling to better account for MathML.  (141632782) Fixed Range.getClientRects to take surrogate pairs into account.  (142098484) Fixed tokenization of the rel attribute of the link element and Link header.  (142600096) Deprecations Removed wheel event handling for <input type="number"> to match platform conventions.  (99318505) Web Authentication Resolved Issues Fixed .catch() for conditional mediation  not getting passed the abort reason that was thrown.  (112178073) Web Extensions New Features Added support for loading Safari Web Extensions that have been Developer ID-signed and notarized.  (40429283) Added support for temporarily installing web extensions from disk without requiring an Xcode project.  (98208121) Added support for getKeys() in storage areas.  (136595295) Added support for i18n.getSystemUILanguage and i18n.getPreferredSystemLanguages.  (136929657) Added support for documentId to the sender message object.  (137532821) Added support for documentId to tabs.sendMessage() and tabs.connect().  (137532897) Added support for documentId in webNavigation.  (137532909) Added support for documentId to webRequest.  (141058456) Added support for documentId to scripting and tabs.  (141291546) Added support for match_about_blank and match_origin_as_fallback to inject content scripts and styles into more frames.  (145875291) Resolved Issues Fixed CORS for Web Extension pages to respect granted per-site permissions. Developers will need to add a browser.permissions.request({origins: []}) call before doing any fetch() that is blocked by CORS.  (102912898) Fixed an issue causing content blockers to not hide content in about:blank frames.  (134273470) Fixed a slowdown in applying rulesets and dynamic rules in declarativeNetRequest.  (136394861) (FB15196130) Fixed clicking the “Clear Storage…” button in Safari Extensions Settings.  (137533628) Fixed storage.onChanged returning undefined as the areaName.  (138086765) Fixed the tabs field missing from the result returned by windows.create.  (138529797) Fixed es-419 support in Web Extensions.  (138857112) Fixed the webRequest.onBeforeRequest event missing the requestBody.  (140338580) (FB15911234) Fixed blurry extension icons.  (142070967) (FB16171862) Fixed not picking the “zh” locale when “zh-Hant” is preferred.  (142602243) (FB16271745) Fixed webRequest event listeners to honor extraInfoSpec for better performace.  (142907168) Fixed web extension resources to be treated as UTF-8 by default.  (143079179) Web Inspector New Features Added support for ignoreList in sourcemaps.  (130630075) Added support for viewport presets in Responsive Design Mode.  (131541189) Added support for the Apps and Devices Inspector.  (134519731) Exposed cookie Partition Key in Web Inspector.  (136293236) Added the ability to modify only the headers of a request using a Request Local Override.  (139043491) Added support for sending Android user agents using the device override menu when Web Inspector is connected to a remote device.  (139305520) Added support for DOMRect in console.screenshot.  (141650264) Added an orientation toggle to rotate a viewport preset in Responsive Design Mode.  (142632311) Resolved Issues Fixed ensuring that all of the Desktop Sites on iPad site-specific hacks are disabled when the site-specific hacks setting is turned off in Web Inspector.  (50035167) Fixed style rules to stay editable after being modified by CSSOM in JavaScript.  (124650808) Fixed glitches when trying to edit a style from a stylesheet that has an @import statement.  (131756178) Fixed error cases to match new source map specification.  (137934436) Fixed the overview icon to be inverted dark mode in the Graphics tab.  (140602803) Fixed recorded WebGL objects not getting highlighted correctly in the Graphics tab.  (140625113) WebAssembly New Features Added support for JIT-less Wasm.  (113768974) Added support for the new Wasm Exception Specification.  (131409318) Implemented relaxed laneselect SIMD instructions.  (138484223) Resolved Issues Fixed Wasm legacy catch_all instruction to correctly catch thrown JS primitives.  (135972897) WebDriver Resolved Issues Fixed a crash that could occur when simulating drag events with the right mouse button.  (137068514) WebKit New Features Added support for WKWebExtension, WKWebExtensionContext, and WKWebExtensionController Swift and Objective-C classes to support integrating Web Extensions into WebKit-based browsers.  (121537087) WebRTC New Features Added support for MediaSession capture mute API.  (131386187) Added support for stuns server URIs.  (136505783) Added support for enumerated visible network interfaces.  (137067672) Added support for the Speaker Selection API on macOS.  (140918327) Resolved Issues Fixed MediaSession.setMicrophoneActive(true) prompting repeatedly if the microphone was muted by the user-agent once.  (135941062) Fixed setCameraActive to not unmute microphone if the user-agent previously muted both camera and microphone.  (136221456) Fixed AirPods unmuting to not unmute the camera if website muted the camera.  (137065964) Fixed voice search to not re-prompt for camera or microphone permission after a page-initiated same origin navigation.  (138122655) WKWebView New Features Added support for customizing the file upload flow for file inputs.  (130219174) Added support for WKNavigationAction/buttonNumber and WKNavigationAction/modifierFlags as API on iOS.  (136865172) Added support for the Writing Tools API in visionOS.  (140412673) Resolved Issues Fixed calling WKWebView.evaluateJavaScript in an async context when nothing is returned by JS.  (139618495) (FB15755273)

## See Also

### Version 18

- [Safari 18.6 Release Notes](safari-release-notes/safari-18_6-release-notes.md)
- [Safari 18.5 Release Notes](safari-release-notes/safari-18_5-release-notes.md)
- [Safari 18.3 Release Notes](safari-release-notes/safari-18_3-release-notes.md)
- [Safari 18.2 Release Notes](safari-release-notes/safari-18_2-release-notes.md)
- [Safari 18.1 Release Notes](safari-release-notes/safari-18_1-release-notes.md)
- [Safari 18.0.1 Release Notes](safari-release-notes/safari-18_0_1-release-notes.md)
- [Safari 18 Release Notes](safari-release-notes/safari-18-release-notes.md)