# Safari Technology Preview 30 Release Notes Preview the latest web technology updates including: Web API, JavaScript, CSS, Accessibility, Web Inspector, WebDriver, Media, and Rendering. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 30 is now [available for download](https://webkit.org/downloads/) for macOS 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 [215859-216643](https://trac.webkit.org/log?stop_rev=215859&rev=216643&limit=589). ### Web API - Implemented Subresource Integrity (SRI) ([r216347](https://trac.webkit.org/changeset/216347)) - Implemented `X-Content-Type-Options:nosniff` ([r215753](https://trac.webkit.org/changeset/215753), [r216195](https://trac.webkit.org/changeset/216195)) - Added support for Unhandled Promise Rejection events ([r215916](https://trac.webkit.org/changeset/215916)) - Updated `document.cookie` to only return cookies if the document URL has a network scheme or is a file URL ([r216341](https://trac.webkit.org/changeset/216341)) - Removed the non-standard `document.implementation.createCSSStyleSheet()` API ([r216458](https://trac.webkit.org/changeset/216458)) - Removed the non-standard `Element.scrollByLines()` and `scrollByPages()` ([r216456](https://trac.webkit.org/changeset/216456)) - Changed to allow a null comparator in `Array.prototype.sort` ([r216169](https://trac.webkit.org/changeset/216169)) - Changed to set the `Response.blob()` type based on the `content-type` header value ([r216353](https://trac.webkit.org/changeset/216353)) - Changed `Element.slot` to be marked as `[Unscopable]` ([r216228](https://trac.webkit.org/changeset/216228)) - Implemented `HTMLPreloadScanner` support for `` ([r216143](https://trac.webkit.org/changeset/216143)) - Fixed setting `Response.blob()` type correctly when the body is a `ReadableStream` ([r216073](https://trac.webkit.org/changeset/216073)) - Moved `offsetParent`, `offsetLeft`, `offsetTop`, `offsetWidth`, `offsetHeight` properties from `Element` to `HTMLElement` ([r216466](https://trac.webkit.org/changeset/216466)) - Moved the `style` property from `Element` to `HTMLElement` and `SVGElement`, then made it settable ([r216426](https://trac.webkit.org/changeset/216426)) ### JavaScript - Fixed Arrow function access to `this` after `eval('super()')` within a constructor ([r216329](https://trac.webkit.org/changeset/216329)) - Added support for dashed values in unicode locale extensions ([r216122](https://trac.webkit.org/changeset/216122)) - Fixed the behaviour of the `.sort(callback)` method to match Firefox and Chrome ([r216137](https://trac.webkit.org/changeset/216137)) ### CSS - Fixed `space-evenly` behavior with Flexbox ([r216536](https://trac.webkit.org/changeset/216536)) - Fixed `font-stretch:normal` to select condensed fonts ([r216517](https://trac.webkit.org/changeset/216517)) - Fixed custom properties used in `rgb()` with `calc()` ([r216188](https://trac.webkit.org/changeset/216188)) ### Accessibility - Fixed the behavior of `aria-orientation="horizontal"` on a list ([r216452](https://trac.webkit.org/changeset/216452)) - Prevented exposing empty `roledescription` ([r216457](https://trac.webkit.org/changeset/216457)) - Propagated `aria-readonly` to grid descendants ([r216425](https://trac.webkit.org/changeset/216425)) - Changed to ignore `aria-rowspan` value if a `rowspan` value is provided for a `` or `` ([r216167](https://trac.webkit.org/changeset/216167)) - Fixed an issue causing VoiceOver to skip cells after a cell with `aria-colspan` ([r216134](https://trac.webkit.org/changeset/216134)) - Changed to treat cells with ARIA table cell properties as cells ([r216123](https://trac.webkit.org/changeset/216123)) - Updated implementation of `aria-orientation` to match specifications ([r216089](https://trac.webkit.org/changeset/216089)) ### Web Inspector - Added resource load error reason text in the details sidebar ([r216564](https://trac.webkit.org/changeset/216564)) - Fixed toggling the Request and Response resource views in certain cases ([r216461](https://trac.webkit.org/changeset/216461)) - Fixed miscellaneous RTL and localization issues ([r216465](https://trac.webkit.org/changeset/216465), [r216629](https://trac.webkit.org/changeset/216629)) - Fixed Option-Click on URL behavior in Styles sidebar ([r216166](https://trac.webkit.org/changeset/216166)) - Changed 404 Image Loads to appear as a failures in Web Inspector ([r216138](https://trac.webkit.org/changeset/216138)) ### WebDriver - Fixed several issues that prevented cookie-related endpoints from working correctly ([r216258](https://trac.webkit.org/changeset/216258/webkit), [r216261](https://trac.webkit.org/changeset/216261/webkit), [r216292](https://trac.webkit.org/changeset/216292/webkit)) ### Media - Removed black background from video layer while in fullscreen ([r216472](https://trac.webkit.org/changeset/216472)) ### Rendering - Fixed problem with the CSS Font Loading API’s `load()` function erroneously resolving promises when used with preinstalled fonts ([r216079](https://trac.webkit.org/changeset/216079)) - Fixed flickering on asynchronous image decoding and ensured the image is incrementally displayed as new data is received ([r216471](https://trac.webkit.org/changeset/216471)) --- Copyright © 2026 Apple Inc. 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