---
title: Safari 15.4 Release Notes
framework: safari-release-notes
role: article
role_heading: Article
path: safari-release-notes/safari-15_4-release-notes
---

# Safari 15.4 Release Notes

Released March 14, 2022 — Version 15.4 (17613.1.17)

## Overview

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 <input type="checkbox">, <input type="radio">, <progress>, <select>; text-input types with a <datalist> in macOS, iPadOS, and iOS; and <input type="range">, <button>, and <input type="button"> 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 <dialog> element. Added lazy-loading support for images with the loading attribute on the <img> 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.

## See Also

### Version 15

- [Safari 15.6 Release Notes](safari-release-notes/safari-15_6-release-notes.md)
- [Safari 15.5 Release Notes](safari-release-notes/safari-15_5-release-notes.md)
- [Safari 15.2 Release Notes](safari-release-notes/safari-15_2-release-notes.md)
- [Safari 15 Release Notes](safari-release-notes/safari-15-release-notes.md)