# Safari Technology Preview 41 Release Notes Preview the latest web technology updates including: File and Directory Entries API, CSS, WebRTC, Drag and Drop, Web API, JavaScript, WebCrypto, WebGL, Media, Rendering, Accessibility, Storage, Web Driver, Web Inspector, and bug fixes. ## Overview [Safari Technology Preview](https://webkit.org/blog/6017/introducing-safari-technology-preview/) Release 41 is now [available for download](https://webkit.org/downloads/) for macOS Sierra and 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 [221968-222556](https://trac.webkit.org/log?stop_rev=221968&rev=222556&limit=999). ### File and Directory Entries API - Enabled File and Directory Entries API ([r222412](https://trac.webkit.org/changeset/222412/webkit/)) ### CSS - Added support for `min()` and `max()` in `calc()` ([r222190](https://trac.webkit.org/changeset/222190/webkit/)) - Added `env()` as an alias of `constant()` to match the evolving specification ([r222402](https://trac.webkit.org/changeset/222402/webkit/)) - Made more of the CSS animation system internals element based ([r221980](https://trac.webkit.org/changeset/221980/webkit/)) - Prevented `fit-content()` tracks from stretching ([r222440](https://trac.webkit.org/changeset/222440/webkit/)) - Removed CSS Regions support ([r222435](https://trac.webkit.org/changeset/222435/webkit/), [r222259](https://trac.webkit.org/changeset/222259/webkit/), [r222423](https://trac.webkit.org/changeset/222423/webkit/), [r222356](https://trac.webkit.org/changeset/222356/webkit/)) ### Bug Fixes - Fixed an issue introduced in Safari Technology Preview 40 where websites would log users out immediately after logging in ### WebRTC - Fixed `RTCDataChannel` connectivity issues ([r222045](https://trac.webkit.org/changeset/222045/webkit/)) ### Drag and Drop - Enabled `DataTransfer.prototype.items` by default ([r222376](https://trac.webkit.org/changeset/222376)) - Expose text/html and text/uri-list in `DataTransfer.prototype.items` ([r222363](https://trac.webkit.org/changeset/222363)) - Fixed `DataTransfer` to stop exposing local file paths when dropping files ([r222257](https://trac.webkit.org/changeset/222257/webkit/)) ### Web API - Changed `history.pushState()` and `history.replaceState()` to align more closely to the HTML standard ([r221978](https://trac.webkit.org/changeset/221978/webkit/)) - Changed to use a high resolution timestamp for event time ([r222392](https://trac.webkit.org/changeset/222392/webkit/)) ### JavaScript - Added a small optimization for async generators ([r222425](https://trac.webkit.org/changeset/222425/webkit/)) ### WebCrypto - Added support for Elliptic Curve P-521 ([r222316](https://trac.webkit.org/changeset/222316/webkit/)) ### WebGL - Added bindings for optional arguments to some WebGL2 methods ([r222258](https://trac.webkit.org/changeset/222258/webkit/)) - Enabled passing sequences to various WebGL2 methods ([r222026](https://trac.webkit.org/changeset/222026/webkit/)) - Fixed accelerated `texImage2D` for video to respect `flipY` in WebGL ([r222197](https://trac.webkit.org/changeset/222197/webkit/)) - Fixed `VideoTextureCopierCV` to correctly restore vertex attribute state ([r222198](https://trac.webkit.org/changeset/222198/webkit/)) - Updated some WebGL2 return types to match the specification ([r222096](https://trac.webkit.org/changeset/222096/webkit/)) ### Media - Aligned Media Source Extension IDL with spec ([r222443](https://trac.webkit.org/changeset/222443/webkit/)) ### Rendering - Changed to avoid style recomputation when forwarding a focus event to a text field’s input type ([r222114](https://trac.webkit.org/changeset/222114/webkit/)) - Changed to avoid style resolution when clearing focused element ([r222164](https://trac.webkit.org/changeset/222164/webkit/), [r222167](https://trac.webkit.org/changeset/222167/webkit/)) - Fixed computing animated style to not require renderers ([r222129](https://trac.webkit.org/changeset/222129/webkit/)) - Fixed partial frame rendering that can occur even after loading all of the encoded data ([r222427](https://trac.webkit.org/changeset/222427/webkit/)) - Fixed the width of a child’s margin box to always be equal to that of its containing block in regular block layout ([r222321](https://trac.webkit.org/changeset/222321/webkit/)) - Fixed the spelling, grammar, and correction dots that were being painted upside down ([r222065](https://trac.webkit.org/changeset/222065/webkit/)) ### Accessibility - Fixed ARIA grids that claim to be `multiselectable` even with `aria-multiselectable` is set to `false` ([r222527](https://trac.webkit.org/changeset/222527/webkit/)) ### Storage - Added Cache API support of records persistency ([r222073](https://trac.webkit.org/changeset/222073/webkit/)) - Changed `IDBRequest` and `IDBTransaction` error properties to be `DOMExceptions` ([r222250](https://trac.webkit.org/changeset/222250/webkit/)) ### Web Driver - Fixed an issue that prevented clicking on `overflow: hidden` elements without children ([r222536](https://trac.webkit.org/changeset/222536/webkit)) - Fixed an issue that prevented clicking on `