# Safari 15.4 Release Notes Released March 14, 2022 — Version 15.4 (17613.1.17) ## Overview Safari 15.4 ships with the iOS and iPadOS 15.4 and macOS 12.3. ### General #### Known Issues - Safari 15.4 in macOS Catalina running on an iMac (Late 2012 or 2013) with a NVIDIA GPU may experience multiple sites that fail to load or continuously refresh after loading. (88177392) ### CSS #### New Features - Added `::backdrop` pseudo-element support. - Added support for CSS Containment with the `contain` property. - Added CSS Cascade Layer support for improved developer control over cascading rules. - Added `accent-color` support to alter the accent color of form controls ``, ``, ``, ``; text-input types with a ``, ``, and `` in iPadOS and iOS. - Added `:has()` pseudo-class support to match an element with an element that matches a given selector. - Added support for `text-decoration-skip-ink` to control how underlines and overlines are rendered. - Added support for small (`svw`, `svh`, `svi`, `svb`, `svmin`, `svmax`), large (`lvw`, `lvh`, `lvi`, `lvb`, `lvmin`, `lvmax`), dynamic (`dvw`, `dvh`, `dvi`, `dvb`, `dvmin`, `dvmax`), and logical (`vi`, `vb`) viewport units. - Added support for the `:focus-visible` pseudo-class to style the focus indicator only when rendered by the browser. - Added support for the `font-palette` property and the `@font-palette-values` rule to support recoloring color fonts. - Implemented the `ic` unit, equivalent to inline direction length (width or height) of the “水” glyph in the element’s current font. - Implemented `calc()` math functions including `sin`, `cos`, `tan`, `e`, `pi`, `exp`, `log`, `atan`, `acos`, `asin`, and `atan2`. - Added the `appearance` property, including `appearance: auto`, and aliased `-webkit-appearance` to the unprefixed property. - Added the `mask` property, along with the long-hand forms `mask-image`, `mask-size`, `mask-repeat-x`, `mask-repeat-y`, `mask-origin`, and aliased `-webkit-mask`. - Added the `backface-visibility` property and aliased `-webkit-backface-visibility` to the unprefixed property. - Added the `text-combine-upright` property and aliased `-webkit-text-combine` to the unprefixed property. - Added the `print-color-adjust` property and aliased `-webkit-print-color-adjust` to the unprefixed property. - Added the `match-parent` CSS value and aliased `-webkit-match-parent` for the `text-align` CSS property. #### Resolved Issues - Fixed the drawing area to be painted when the computed `border-width` is 0 and the `border-image-width` is set or defaults to a number. - Fixed `rem` in media queries to calculate using `font-size: initial`, not the root element `font-size`. - Fixed `background-attachment: local`. - Fixed gradient color interpolation for colors with alpha transparency. #### Removed Features - Removed non-standard CSS properties `-webkit-border-fit`, `-webkit-margin-collapse`, `-webkit-margin-top-collapse`, `-webkit-margin-bottom-collapse`, `-webkit-margin-before-collapse`, `-webkit-margin-after-collapse`, and `-webkit-background-composite`. ### HTML #### New Features - Added support for the `

` element. - Added lazy-loading support for images with the `loading` attribute on the `` element. - Added support for the `autofocus` attribute. ### Web API #### New Features - Added support for Web App Manifest icons, shown when no `apple-touch-icon` is provided and when either `"purpose": "any"` is present or the `"purpose"` key isn’t present at all. - Improved Web App Manifest to always attempt to fetch the manifest file. - Enabled BroadcastChannel for communication between different windows, tabs, frames, or iframes. - Added support for ServiceWorker downloads. - Added support for ServiceWorker Navigation Preload. - Added support for the CSS `scroll-behavior` property and `ScrollOptions`, allowing smooth scrolling to anchors or via JavaScript. - Added support for the `ResizeObserverEntry` and `ResizeObserverSize` interfaces. - Added support for the Web Locks API. - Added support for recurring payments with the Payment Request API. - Added support for controlling the initially selected shipping method in the Payment Request API. #### Resolved Issues - Fixed Fetch using `FormData` with a file not going through ServiceWorker. #### Removed Features - Removed the XSS Auditor. ### JavaScript #### New Features - Added `Object.hasOwn()`. - Added `self.structuredClone()`. - Added `Array.prototype.findLast` and `Array.prototype.findLastIndex`. - Added `Array.prototype.at` , `String.prototype.at` , and `TypedArray.prototype.at`. - Added `Intl.NumberFormat.prototype.formatRange` and `Intl.NumberFormat.prototype.formatRangeToParts`. - Added `Intl.PluralRules.prototype.selectRange`. - Added the `Intl` enumeration. - Added the `Intl.Locale` info extension. - Updated `Intl.DisplayNames` to V2. - Updated `Intl.NumberFormat` to V3, supporting new options. - Supported the `TimeZoneName` option in `Intl.DateTimeFormat`. ### Media #### New Features - Added support for WebRTC perfect negotiation. - Added in-band chapter tracks support. ### Private Click Measurement #### New Features - Enabled unlinkable tokens for triggering events on a merchant website. - Added support for same-site conversion pixels on merchant websites, to enable removal of cross-site tracking pixels. - Allowed measurement of links in nested, cross-site iframes on publisher websites. ### Safari Web Extensions #### New Features - Added support for `manifest_version` 3 and related API changes. - Added support for `service_worker` background scripts as an alternative to nonpersistent background pages. - Added support for script and style injection via the `browser.scripting` APIs. - Added support for dynamic and session rules via the `browser.declarativeNetRequest` APIs. - Added support for webpage-to-extension messaging using `externally_connectable:matches`. ### Resolved Issues - Fixed: Limits are now enforced on the size and number of items in extension sync storage. - Fixed: More directives are now allowed to be included in the `content_security_policy` of an extension’s manifest, such as the `sandbox` directive. - Fixed: Special matching characters (`*`, `|`, `||`, and `^`) in `urlFilter` of `declarativeNetRequest` rules are now handled, instead of being treated as regex patterns. - Fixed: `Promise` returns from `runtime.onMessage` listeners are now allowed for the message reply. ### Security #### New Features - Improved support for Content Security Policy 3: - Added correct blocked resource violation reporting for inline script, inline style, and eval execution. - Added support for the `'strict-dynamic'` source expression. - Added support for the `'unsafe-hashes'` source expression. - Added support to allow external JavaScript matching hash source expressions. - Added support for the `'report-sample'` expression. ### Web Inspector #### New Features - Added CSS alignment controls in the Styles panel. - Added support for showing the related `@layer` for CSS rulesets in the Styles panel. - Improved CSS auto-completion in the Styles panel with fuzzy matching. - Added CSS variables grouping by type in the Computed panel. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)