Apple has released the first update to Safari Technology Preview browser.
Safari Technology Preview Release Notes
Release 2
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
• Disallowed var assignments in for-in loops according to ES6 specs
• Improved stability for ES6 classes when invoking a method of the parent class before calling super() in a constructor
• Allowed undefined or null for Symbol.search and Symbol.match
• Enabled Array.prototype native functions’ species constructors to work with proxies
• Implemented the proposal for String.prototype.padStart() and String.prototype.padEnd()
• Implemented ES6 spec for String.prototype.match and RegExp.prototype[@@match]
• Included a workaround for web compatibility on ES6 TypeErrors when accessing RegExp.prototype flag properties
• Corrected quantified unicode regular expressions
• Ensured greedy unicode regular expressions properly backtrack past non-BMP characters
CSS
• Implemented the allow-end value of the hanging-punctuation CSS property
• Improved web compatibility by resetting CSS spacing rules on elements
• Added the new color-gamut CSS media query
• Updated screen queries to check the capabilities of the current screen instead of the deepest available screen
Web APIs
• Restricted WebSockets header parsing according to RFC6455 and RFC7230
• Improved performance of certain draw calls in WebGL with a non-power-of-two texture optimization
• Disabled the Fetch API until the implementation is ready to be enabled by default
• Enhanced Shadow DOM support to compute styles for the style attribute of elements
• Softened pushState and replaceState frequency restrictions
Web Inspector
• Timelines tab performance and bug fixes
• Disabled debugger statements while profiling a page to ensure maximum performance accuracy
• Added the ability to configure timeline instruments to use for recordings
• Added a paint count indicator in the top left corner of non-opaque layers
• Added font-variant-numeric to CSS autocompletions
• Added the console.takeHeapSnapshot method for capturing heap snapshots
• Changed details sidebar shortcuts to Command-Option-0 and Command-Shift-0
• Double-quotes and backslashes in strings are now displayed correctly in the console
• Improved the consistency of CSP directive violation messages reported in the console
Accessibility
• Corrected new lines in content editable elements to notify accessibility
• Updated the handling of SVG elements with a presentational role to be the same as other host language elements
• Limited the numbered list announcement for a list item number to the first line of text in the list item
• Changed the accessibility role descriptions for JavaScript alerts to “web dialog” and “web alert dialog” to make them more understandable to screen reader users
Rendering
• Updated backdrop filter to repaint when changed in JavaScript
• Corrected drawing SVG stroke patterns for objects with empty bounding box elements
Media
• Improved stability when an audio source is changed while being processed
• Fixed audio track listings
Networking
• Improved the reliability of speculative disk cache validation requests with the HTTP Referer header
Bug Fixes
• Fixed autoscrolling in a drag selection when a window is against the screen edge, including while in full screen mode
More info and download links here.
[Thanks to MacDailyNews Readers “Fred Mertz” and “Albert P.” for the heads up.]