# Safari Technology Preview 2 Release Notes Preview the latest web technology updates including: Browser Differences, JavaScript, CSS, Web APIs, Web Inspector, Accessibility, Rendering, Media, Networking, and bug fixes. ## Overview [Safari Technology Preview](/blog/6017/introducing-safari-technology-preview/) Release 2 is now [available for download](https://developer.apple.com/safari/download/). If you already have Safari Technology Preview installed, you can update from the [Mac App Store’s Updates tab](macappstore://showUpdatesPage). Release 2 of Safari Technology Preview covers WebKit revisions [198530–199085](https://trac.webkit.org/log?action=stop_on_copy&mode=follow_copy&rev=199085&stop_rev=198530&limit=999). ### Browser Differences - Changed the CFBundleSignature to allow Apple Events, like those sent from AppleScript, to correctly distinguish between Safari and Safari Technology Preview ### JavaScript - Added ES6 support for `Symbol.isConcatSpreadable` ([r198808](https://trac.webkit.org/changeset/198808/)) - Disallowed `var` assignments in `for-in` loops according to ES6 specs ([r198928](https://trac.webkit.org/changeset/198928/)) - Improved stability for ES6 classes when invoking a method of the parent class before calling `super()` in a constructor ([r198714](https://trac.webkit.org/changeset/198714/)) - Allowed `undefined` or `null` for `Symbol.search` and `Symbol.match` ([r198581](https://trac.webkit.org/changeset/198581/)) - Enabled `Array.prototype` native functions’ species constructors to work with proxies ([r198589](https://trac.webkit.org/changeset/198589/)) - Implemented the proposal for `String.prototype.padStart()` and `String.prototype.padEnd()` ([r198674](https://trac.webkit.org/changeset/198674/)) - Implemented ES6 spec for `String.prototype.match` and `RegExp.prototype[@@match]` ([r198554](https://trac.webkit.org/changeset/198554/)) - Included a workaround for web compatibility on ES6 TypeErrors when accessing `RegExp.prototype` flag properties ([r198698](https://trac.webkit.org/changeset/198698/)) - Corrected quantified unicode regular expressions ([r198866](https://trac.webkit.org/changeset/198866/)) - Ensured greedy unicode regular expressions properly backtrack past non-BMP characters ([r198624](https://trac.webkit.org/changeset/198624/)) ### CSS - Implemented the `allow-end` value of the `hanging-punctuation` CSS property ([r198683](https://trac.webkit.org/changeset/198683/)) - Improved web compatibility by resetting CSS spacing rules on `$` elements ([r198952](https://trac.webkit.org/changeset/198952/)) - Added the new `color-gamut` CSS media query ([r199024](https://trac.webkit.org/changeset/199024/)) - Updated screen queries to check the capabilities of the current screen instead of the deepest available screen ([r198595](https://trac.webkit.org/changeset/198595/)) ### Web APIs - Restricted WebSockets header parsing according to RFC6455 and RFC7230 ([r198561](https://trac.webkit.org/changeset/198561/)) - Improved performance of certain draw calls in WebGL with a non-power-of-two texture optimization ([r198588](https://trac.webkit.org/changeset/198588/)) - Disabled the Fetch API until the implementation is ready to be enabled by default ([r199081](https://trac.webkit.org/changeset/199081/)) - Enhanced Shadow DOM support to compute styles for the style attribute of `` elements ([r198990](https://trac.webkit.org/changeset/198990/)) - Softened `pushState` and `replaceState` frequency restrictions ([r198687](https://trac.webkit.org/changeset/198687/)) ### Web Inspector - Timelines tab performance and bug fixes ([r198550](https://trac.webkit.org/changeset/198550/), [r198563](https://trac.webkit.org/changeset/198563/), [r198601](https://trac.webkit.org/changeset/198601/), [r198602](https://trac.webkit.org/changeset/198602/), [r198603](https://trac.webkit.org/changeset/198603/), [r198618](https://trac.webkit.org/changeset/198618/), [r198620](https://trac.webkit.org/changeset/198620/), [r198745](https://trac.webkit.org/changeset/198745/), [r199077](https://trac.webkit.org/changeset/199077/), [r199085](https://trac.webkit.org/changeset/199085/)) - Disabled `debugger` statements and breakpoints while profiling a page to ensure maximum performance accuracy ([r198648](https://trac.webkit.org/changeset/198648/)) - Added the ability to configure timeline instruments to use for recordings ([r198537](https://trac.webkit.org/changeset/198537/)) - Added a paint count indicator in the top left corner of non-opaque layers ([r198599](https://trac.webkit.org/changeset/198599/)) - Added `font-variant-numeric` to CSS autocompletions ([r198750](https://trac.webkit.org/changeset/198750/)) - Added the `console.takeHeapSnapshot` method for capturing heap snapshots ([r198786](https://trac.webkit.org/changeset/198786/)) - Changed details sidebar shortcuts to Command-Option-0 and Command-Shift-0 ([r199082](https://trac.webkit.org/changeset/199082/)) - Double-quotes and backslashes in strings are now displayed correctly in the console ([r198585](https://trac.webkit.org/changeset/198585/)) - Improved the consistency of CSP directive violation messages reported in the console ([r198591](https://trac.webkit.org/changeset/198591/)) ### Accessibility - Corrected new lines in content editable elements to notify accessibility ([r199030](http://trac.webkit.org/changeset/199030/trunk)) - Updated the handling of SVG elements with a presentational role to be the same as other host language elements ([r198870](http://trac.webkit.org/changeset/198870/trunk)) - Limited the numbered list announcement for a list item number to the first line of text in the list item ([r198806](http://trac.webkit.org/changeset/198806/trunk)) - Changed the accessibility role descriptions for JavaScript alerts to “web dialog” and “web alert dialog” to make them more understandable to screen reader users ([r198543](http://trac.webkit.org/changeset/198543/trunk)) ### Rendering - Updated backdrop filter to repaint when changed in JavaScript ([r198963](http://trac.webkit.org/changeset/198963/trunk)) - Corrected drawing SVG stroke patterns for objects with empty bounding box elements ([r198574](http://trac.webkit.org/changeset/198574/trunk)) ### Media - Improved stability when an audio source is changed while being processed ([r198654](http://trac.webkit.org/changeset/198654/trunk)) - Fixed audio track listings ([r198703](http://trac.webkit.org/changeset/198703/trunk)) ### Networking - Improved the reliability of speculative disk cache validation requests with the HTTP `Referer` header ([r198741](http://trac.webkit.org/changeset/198741/trunk)) ### Bug Fixes - Fixed autoscrolling in a drag selection when a window is against the screen edge, including while in full screen mode ([r198692](http://trac.webkit.org/changeset/198692/trunk)) --- Copyright © 2026 Apple Inc. 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