# Safari Technology Preview 38 Release Notes Preview the latest web technology updates including: Beacon API, Fetch API, Web Payments, CSS, Web API, Media, Apple Pay, Web Inspector, and WebDriver. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 38 is now [available for download](https://webkit.org/downloads/) for macOS Sierra and betas of macOS High Sierra. If you already have Safari Technology Preview installed, you can update from the Mac App Store’s Updates tab. This release covers WebKit revisions [220128-220795](https://trac.webkit.org/log?stop_rev=220128&rev=220795&limit=999). ### Beacon API - Enabled the Beacon API by default as an experimental feature ([r220553](https://trac.webkit.org/changeset/220553/webkit/)) - Added support for CORS-preflighting ([r220442](https://trac.webkit.org/changeset/220442/webkit/)) - Added support for CORS-preflighting on redirects ([r220497](https://trac.webkit.org/changeset/220497/webkit/)) - Added support for `connect-src` CSP checks on redirects ([r220549](https://trac.webkit.org/changeset/220549/webkit/)) - Updated `sendBeacon()` to rely on FetchBody instead of the whole FetchRequest ([r220366](https://trac.webkit.org/changeset/220366/webkit/)) - Changed to use “application/octet-stream” `content-type` for payloads of `ArrayBuffer` and `ArrayBufferView` types ([r220779](https://trac.webkit.org/changeset/220779/webkit/)) ### Fetch API - Added support for Request `keepalive` getter ([r220244](https://trac.webkit.org/changeset/220244/webkit/)) - Changed Response to keep all ResourceResponse information ([r220320](https://trac.webkit.org/changeset/220320/webkit/)) - Implemented quota limitation for `keepalive` Fetch requests ([r220751](https://trac.webkit.org/changeset/220751/webkit/)) ### Web Payments - Enabled Payment Requests as an experimental feature ([r220787](https://trac.webkit.org/changeset/220787/webkit/)) ### CSS - Added support for parsing of the `font-display` property ([r220725](https://trac.webkit.org/changeset/220725/webkit/)) - Implement `caret-color` support ([r220706](https://trac.webkit.org/changeset/220706/webkit/), [r220714](https://trac.webkit.org/changeset/220714/webkit/)) - Added a fast path for `rotate()` and `rotateZ()` transform parsing ([r220382](https://trac.webkit.org/changeset/220382/webkit/)) - Fixed parsing of `` to allow time starting with a ‘.’ without a leading 0 ([r220252](https://trac.webkit.org/changeset/220252/webkit/)) - Fixed a hit testing issue occurring when an SVG `rect` element with a non-default stroke style applied ([r220717](https://trac.webkit.org/changeset/220717/webkit/)) ### Web API - Added support for considering file extensions in the `accept` attribute of HTML file input elements ([r220135](https://trac.webkit.org/changeset/220135/webkit/)) - Improved support for referrer policies ([r220208](https://trac.webkit.org/changeset/220208/webkit/)) - Fixed the Promise resolve and reject function to have a length of 1 ([r220324](https://trac.webkit.org/changeset/220324/webkit/)) - Fixed an early error on an `ANY` operator before `new.target` ([r220481](https://trac.webkit.org/changeset/220481/webkit/)) - Fixed removing an empty `

` element when inside a table cell ([r220398](https://trac.webkit.org/changeset/220398/webkit/)) - Fixed XHR to only fire an abort event if the cancellation was requested by the client ([r220731](https://trac.webkit.org/changeset/220731/webkit/)) ### Media - Fixed deleting the old subtitle track on `src` attribute change event ([r220472](https://trac.webkit.org/changeset/220472/webkit/)) ### Apple Pay - Added support for phonetic contact names ([r220718](https://trac.webkit.org/changeset/220718/webkit/)) ### Web Inspector - Added Canvas path preview when viewing a recording ([r220370](https://trac.webkit.org/changeset/220370/webkit/)) - Changed clicking on an autocomplete suggestion to apply it, not dismiss it ([r220614](https://trac.webkit.org/changeset/220614/webkit/)) - Removed `text-shadow` and `gradient` backgrounds ([r220710](https://trac.webkit.org/changeset/220710/webkit/)) - Updated the filter icon in the styles sidebar ([r220609](https://trac.webkit.org/changeset/220609/webkit/)) ### WebDriver - Added support for interacting with `` and `` elements using the element click command ([r220740](https://trac.webkit.org/changeset/220740/webkit/)) - Added support for uploading files via `` ([r219874](https://trac.webkit.org/changeset/219874/webkit/), [r220115](https://trac.webkit.org/changeset/220115/webkit/), [r220135](https://trac.webkit.org/changeset/220135/webkit/), [r220147](https://trac.webkit.org/changeset/220147/webkit/), [r220222](https://trac.webkit.org/changeset/220222/webkit/)) - Fixed a timeout when a JavaScript alert is shown in `onload` handler ([r220741](https://trac.webkit.org/changeset/220741/webkit/)) - Implemented “normal” and “eager” page load strategies from the W3C specification ([r220317](https://trac.webkit.org/changeset/220317/webkit/)) - Updated code to use in-view center points for clicks and other automation logic ([r220314](https://trac.webkit.org/browser/webkit/?rev=220314)) --- 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)