--- title: Safari Technology Preview 8 Release Notes framework: safari-technology-preview-release-notes role: article role_heading: Article path: safari-technology-preview-release-notes/stp-release-8 --- # Safari Technology Preview 8 Release Notes Preview the latest web technology updates including: JavaScript, CSS, Web APIs, Apple Pay, Web Inspector, Media, Rendering, Accessibility, Security, and bug fixes. ## Overview Overview Safari Technology Preview Release 8 is now available for download for both macOS Sierra beta 2 and OS X El Capitan. If you already have Safari Technology Preview installed, you can update from the Mac App Store’s Updates tab. Release 8 of Safari Technology Preview covers WebKit revisions 202085–202612. JavaScript Achieved 100% ECMAScript 2015 (ES6) support by adding back Symbol.isConcatSpreadable (r202125) Unified the handling of regular expression character escapes \\w and \\W and word assertions \\b and \\B (r202490) Implemented isFinite and isNaN in JavaScript for a performance benefit (r202413) Fixed a crash when a finally clause is used inside a for-in loop (r202608) CSS Updated :default CSS pseudo-class to match checkbox and radio inputs with a checked attribute (r202245) Fixed an issue where the :hover CSS pseudo-class would match after the cursor left the element (r202324) Prevented :in-range and :out-of-range CSS pseudo-classes to not match on inputs that do not have range limitations (r202143) Changed :in-range and :out-of-range CSS pseudo-classes to not match disabled or readonly inputs (r202159) Fixed border rendering for elements with min-width: -webkit-fill-available and zero available width (r202103) Fixed style updates applied by :host() when changing the CSS class name of a shadow-host element (r202227) Web APIs Added fallback mechanisms for stretching and mirroring radical symbols in MathML (r202161) Used the MathOperator to handle some non-stretchy operators in MathML (r202271) Set the upper limit for the size or number of pieces of stretchy operators in MathML (r202489) Allowed phrasing content to be accepted in elements (r202572) Fixed a bug retrieving Blobs from IndexedDB using cursors in WebKit2 sandboxing (r202414) Changed synchronous event tracking to each event type instead of each event sequence (r202408) Apple Pay Moved Apple Pay code to the open source repository (r202298, r202309, r202310, r202311, r202312, r202432, r202345, r202346, r202444) Moved WebKit2 Apple Pay code to the open source repository (r202432) Moved the WebKit1 Apple Pay code to the open source repository (r202346) Added a logged error message when passing an invalid API version to ApplePaySession constructor (r202499) Moved the user gesture requirement to the ApplePaySession constructor (r202584) Fixed the Apple Pay total amount error message to trigger for the correct limits (r202582) Added shippingType to the list of valid Apple Pay payment request properties (r202409) Added an exception to Apple Pay when the shipping method has an invalid amount (r202341, r202342) Fixed discounted Apple Pay line items to display positive amounts (r202504) Web Inspector Changed console.profile to use the new Sampling Profiler (r202234) Fixed an infrequent but persistent crash that could occur when closing Web Inspector (r202492, r202515) Prevented automatic timeline recording when Web Inspector is not visible (r202352, r202353) Delayed the first auto-capture heap snapshot during page reloads until after the page performs its first navigation (r202384) Fixed showing impossible values for underflowed bmalloc sizes in the Memory Timeline (r202394) Uncoupled the Quick Console selection updates from the UI to improve testing (r202566) Fixed selectElement.options entries in console for named indexes beyond the collection length (r202568) Fixed the Snapshot List to show the total size and the total live size (r202253) Improved JavaScript Heap Snapshot clean up handling (r202383) Ensured localStorage is updated when modifying sessionStorage (r202529) Fixed broken text search in resources with (r202498) Media Fixed picture-in-picture placeholder visibility when the controls attribute is removed (r202509) Fixed the volume slider for web video playback controls for right-to-left content (r202183) Implemented support for “replacement” codec (r202599) Fixed an issue where media controls stop working after exiting picture-in-picture mode (r202333) Fixed media elements to not lose playback controls when muted by a user gesture (r202459) Fixed the playback controls element used when playing multiple items in a page (r202425) Rendering Fixed the position for composition underlines in right-to-left content (r202250) Fixed elements jumping around when subtitle text changes slightly (r202117) Fixed style invalidation for :active when the activated node has no renderer (r202517) Flipped the behavior for the Forward and Back keyboard shortcuts in right-to-left content (r202129) Fixed the placement of