Apple has released Safari Technology Preview 218, the latest version of their developer preview web browser. The preview version of Apple’s popular browser offers developers and other interested users the ability to try out features that may or may not, debut in future public release versions of Safari.

‌Safari Technology Preview‌ 218 includes fixes and updates for CSS, JavaScript, Lockdown Mode, Rendering, SVG, Web API, Web Extensions, Web Inspector, and WebRTC.

The current ‌Safari Technology Preview‌ release is compatible with machines macOS Sonoma and macOS Sequoia, the newest version of macOS.

Overview

Safari Technology Preview Release 218 is now available for download for macOS Sequoia and macOS Sonoma. If you already have Safari Technology Preview installed, you can update it in System Settings under General → Software Update.

This release includes WebKit changes between: 293327@main…293898@main

CSS

New Features

Added support for crossorigin() and referrerpolicy() modifiers on CSS image loads. (293647@main) (149166339)

Resolved Issues

Fixed @font-face font-family descriptor to not allow a list of values. (293892@main) (142009630)

Fixed placeholder visibility to update on input type change. (293346@main) (148681639)

Fixed an issue where float boxes, selections, and carets were incorrectly painted inside skipped subtrees.(293358@main) (148741142)

Fixed incorrect getBoundingClientRect() inside skipped subtree on an out-of-flow positioned box. (293428@main) (148770252)

Fixed: Updated the CSS random() function implementation to match the latest spec changes. (293439@main) (148868731)

Fixed: Replace match-element with element-shared in the random() function to match the standard changes. (293474@main) (148920346)

Fixed making <pre> and other elements use logical margins in the User-Agent stylesheet. (293670@main) (149212392)

JavaScript

New Features

Added more support for Temporal. (293864@main) (75685318)

Resolved Issues

Fixed iterator helpers incorrectly closing iterators on early errors. (293842@main) (148774612)

Fixed Iterator.prototype.reduce failing with an undefined initial parameter. (293797@main) (149470140)

Lockdown Mode

New Features

Added support for more web fonts in Lockdown Mode by replacing a fragile hard-coded allowlist with a safe parser that handles a broader range of fonts without compromising security. (293728@main) (149314760)

Rendering

Resolved Issues

Fixed an issue to allow images in scroll containers to load when they are near the viewport rather than when they are intersecting the viewport. (293552@main) (118706766)

Fixed incorrect ruby annotation positioning in sideways-lr. (293572@main) (148713073)

Fixed: Prevented hit testing content inside a skipped subtree. (293361@main) (148741508)

SVG

New Features

Added support for pointer-events="bounding-box" for SVG group containers. (293473@main) (148181592)

Web API

Resolved Issues

Fixed an issue where pending utterances do not receive an error event when speech synthesis is cancelled.(293536@main) (148731039)

Web Extensions

New Features

Added support for the request-method content blocker trigger field. (293746@main) (148474901)

Resolved Issues

Fixed converting declarativeNetRequest rules so that higher numbers are treated as higher priority. (293546@main) (145570245) (FB16607998)

Fixed an issue causingwasm-unsafe-eval to not get parsed as a valid CSP keyword. (293854@main) (147551225)

Fixed and issue that prevented loading a web accessible resource from a subframe at about:blank. (293839@main) (149494286)

Web Inspector

New Features

Added support in the Debugger tab for stepping over an await statement as though it is synchronous code. (293628@main) (149133320)

WebRTC

New Features

Added support for RTCRtpScriptTransformer.generateKeyFrame to take a rid parameter. (293633@main) (148592676)

While the preview is intended for use by developers and advanced users, to provide Apple with feedback on the development of the Safari browser, it can be run side-by-side with the release version of Safari. The app doesn’t require a developer account to download and install. For more information, visit the Safari Technology Preview website.

Topics macOS News Safari Technology Preview