Release Notes for Safari Technology Preview 7

Safari Technology Preview Release 7 is now available for download. If you already have Safari Technology Preview installed, you can update from the Mac App Store’s Updates tab. Release 7 of Safari Technology Preview covers WebKit revisions 201541–202085.

JavaScript

• Implemented options argument to addEventListener (r201735, r201757)
• Updated JSON.stringify to correctly transform numeric array indices (r201674)
• Improved the performance of Encode operations (r201756)
• Addressed issues with Date setters for years outside of 1900-2100 (r201586)
• Fixed an issue where reusing a function name as a parameter name threw a syntax error (r201892)
• Added the error argument for window.onerror event handlers (r202023)
• Improved performance for accessing dictionary properties (r201562)
• Updated Proxy.ownKeys to match recent changes to the spec (r201672)
• Prevented RegExp unicode parsing from reading an extra character before failing (r201714)
• Updated SVGs to report their memory cost to the JavaScript garbage collector (r201561)
• Improved the sampling profiler to protect itself against certain forms of sampling bias that arise due to the sampling interval being in sync with some other system process (r202021)
• Fixed global lexical environment variables scope for functions created using the Function constructor (r201628)
• Fixed parsing super when the default parameter is an arrow function (r202074)
• Added support for trailing commas in function parameters and arguments (r201725)

CSS

• Added the unprefixed version of the pseudo element ::placeholder (r202066)
• Fixed a crash when computing the style of a grid with only absolute-positioned children (r201919)
• Fixed computing a grid container’s height by accounting for the horizontal scrollbar (r201709)
• Fixed placing positioned items on the implicit grid (r201545)
• Fixed rendering for the text-decoration-style values: dashed and dotted (r201777)
• Fixed support for using border-radius and backdrop-filter properties together (r201785)
• Fixed clipping for border-radius with different width and height (r201868)
• Fixed CSS reflections for elements with WebGL (r201639)
• Fixed CSS reflections for elements with a backdrop-filter property (r201648)
• Improved the Document’s font selection lifetime in preparation for the CSS Font Loading API (r201799)
• Improved memory management for CSS value parsing (r201608)
• Improved font face rule handling for style change calculations (r201971, r202085)
• Fixed multiple selector rule behavior for keyframe animations (r201818)
• Fixed applying CSS variables correctly for writing-mode properties (r201875)
• Added experimental support for spring() based CSS animations (r201759)
• Changed the initial value of background-color to transparent per specs (r201666)

Web APIs

• Changed CanvasRenderingContext2D.createPattern() and CanvasRenderingContext2D.putImageData() to throw the correct exception type and align with the specification (r201664)
• Fixed a number of issues with Web Workers (r201876, r201970, r201918, r201926, r201791, r201898, r201925, r201808)

Web Inspector

• Added ⌘T keyboard shortcut to open the New Tab tab (r201692, r201762)
• Added the ability to show and hide columns in data grid tables (r202009, r202081)
• Fixed an error when trying to delete nodes with children (r201843)
• Added a Top Functions view for Call Trees in the JavaScript & Events timeline (r202010, r202055)
• Added gaps to the overview and category graphs in the Memory timeline where discontinuities exist in the recording (r201686)
• Improved the performance of DOM tree views (r201840, r201833)
• Fixed filtering to apply to new records added to the data grid (r202011)
• Improved snapshot comparisons to always compare the later snapshot to the earlier snapshot no matter what order they were selected (r201949)
• Improved performance when processing many DOM.attributeModified messages (r201778)
• Fixed the 60fps guideline for the Rendering Frames timeline when switching timeline modes (r201937)
• Included the exception stack when showing internal errors in Web Inspector (r202025)
• Added ⌘P keyboard shortcut for quick open (r201891)
• Removed Text → Content subsection from the Visual Styles Sidebar when not necessary (r202073)
• Show <template> content that should not be hidden as Shadow Content (r201965)
• Fixed elements in the Elements tab losing focus when selected by the up or down key (r201890)
• Enabled combining diacritic marks in input fields in Web Inspector (r201592)

Media

• Prevented double-painting the outline of a replaced video element (r201752)
• Properly prevented video.play() for video.src="file" with audio user gesture restrictions in place (r201841)
• Prevented showing the caption menu if the video has no selectable text or audio tracks (r201883)
• Improved performance of HTMLMediaElement.prototype.canPlayType that was accounting for 250–750ms first loading theverge.com (r201831)
• Fixed inline media controls to show PiP and fullscreen buttons (r202075)

Rendering

• Fixed a repaint issue with vertical text in an out-of-flow container (r201635)
• Show text in a placeholder font while downloading the specified font (r201676)
• Fixed rendering an SVG in the correct vertical position when no vertical padding is applied, and in the correct horizontal position when no horizontal padding is applied (r201604)
• Fixed blending of inline SVG elements with transparency layers (r202022)
• Fixed display of hairline borders on 3x displays (r201907)
• Prevented flickering and rendering artifacts when resizing the web view (r202037)
• Fixed logic to trigger new layout after changing canvas height immediately after page load (r201889)

Bug Fixes

• Fixed an issue where Find on Page would show too many matches (r201701)
• Exposed static text if form label text only contains static text (r202063)
• Added Origin header for CORS requests on preloaded cross-origin resources (r201930)
• Added support for the upgrade-insecure-requests (UIR) directive of Content Security Policy (r201679, r201753)
• Added proper element focus and caret destination for keyboard users activating a fragment URL (r201832)
• Increased disk cache capacity when there is lots of free space (r201857)
• Prevented hangs during synchronous XHR requests if a network session doesn’t exist (r201593)
• Fixed the response for a POST request on a blob resource to return a “network error” instead of HTTP 500 response (r201557)
• Restricted HTTP/0.9 responses to default ports and cancelled HTTP/0.9 resource loads if the document was loaded with another HTTP protocol (r201895)
• Fixed parsing URLs containing tabs or newlines (r201740)
• Fixed cookie validation in private browsing (r201967)
• Provided memory cache support for the Vary header (r201800, r201805)