Apple has made available the seventh release of the Safari Technology Preview for developers. As with previous releases, this latest contains a slew of new tweaks and changes for developers to check out.
Here's the full breakdown of what's new in Safari Technology Preview release 7:
JavaScript
- Implemented options argument to addEventListener
- Updated JSON.stringify to correctly transform numeric array indices
- Improved the performance of Encode operations
- Addressed issues with Date setters for years outside of 1900-2100
- Fixed an issue where reusing a function name as a parameter name threw a syntax error
- Added the error argument for window.onerror event handlers
- Improved performance for accessing dictionary properties
- Updated Proxy.ownKeys to match recent changes to the spec
- Prevented RegExp unicode parsing from reading an extra character before failing
- Updated SVGs to report their memory cost to the JavaScript garbage collector
- 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
- Fixed global lexical environment variables scope for functions created using the Function constructor
- Fixed parsing super when the default parameter is an arrow function
- Added support for trailing commas in function parameters and arguments
CSS
- Added the unprefixed version of the pseudo element ::placeholder
- Fixed a crash when computing the style of a grid with only absolute-positioned children
- Fixed computing a grid container's height by accounting for the horizontal scrollbar
- Fixed placing positioned items on the implicit grid
- Fixed rendering for the text-decoration-style values: dashed and dotted
- Fixed support for using border-radius and backdrop-filter properties together
- Fixed clipping for border-radius with different width and height
- Fixed CSS reflections for elements with WebGL
- Fixed CSS reflections for elements with a backdrop-filter property
- Improved the Document's font selection lifetime in preparation for the CSS Font Loading API
- Improved memory management for CSS value parsing
- Improved font face rule handling for style change calculations
- Fixed multiple selector rule behavior for keyframe animations
- Fixed applying CSS variables correctly for writing-mode properties
- Added experimental support for spring() based CSS animations
- Changed the initial value of background-color to transparent per specs
Web APIs
- Changed CanvasRenderingContext2D.createPattern() and CanvasRenderingContext2D.putImageData() to throw the correct exception type and align with the specification
- Fixed a number of issues with Web Workers
Web Inspector
- Added ⌘T keyboard shortcut to open the New Tab tab
- Added the ability to show and hide columns in data grid tables
- Fixed an error when trying to delete nodes with children
- Added a Top Functions view for Call Trees in the JavaScript & Events timeline
- Added gaps to the overview and category graphs in the Memory timeline where discontinuities exist in the recording
- Improved the performance of DOM tree views
- Fixed filtering to apply to new records added to the data grid
- Improved snapshot comparisons to always compare the later snapshot to the earlier snapshot no matter what order they were selected
- Improved performance when processing many DOM.attributeModified messages
- Fixed the 60fps guideline for the Rendering Frames timeline when switching timeline modes
- Included the exception stack when showing internal errors in Web Inspector
- Added ⌘P keyboard shortcut for quick open
- Removed Text → Content subsection from the Visual Styles Sidebar when not necessary
- Showcontent that should not be hidden as Shadow Content
- Fixed elements in the Elements tab losing focus when selected by the up or down key
- Enabled combining diacritic marks in input fields in Web Inspector Enabled combining diacritic marks in input fields in Web Inspector
Media
- Prevented double-painting the outline of a replaced video element
- Properly prevented video.play() for video.src="file" with audio user gesture restrictions in place
- Prevented showing the caption menu if the video has no selectable text or audio tracks
- Improved performance of HTMLMediaElement.prototype.canPlayType that was accounting for 250–750ms first loading theverge.com
- Fixed inline media controls to show PiP and fullscreen buttons
Rendering
- Fixed a repaint issue with vertical text in an out-of-flow container
- Show text in a placeholder font while downloading the specified font
- 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
- Fixed blending of inline SVG elements with transparency layers
- Fixed display of hairline borders on 3x displays
- Prevented flickering and rendering artifacts when resizing the web view
- Fixed logic to trigger new layout after changing canvas height immediately after page load
Bug Fixes
- Fixed an issue where Find on Page would show too many matches
- Exposed static text if form label text only contains static text
- Added Origin header for CORS requests on preloaded cross-origin resources
- Added support for the upgrade-insecure-requests (UIR) directive of Content Security Policy
- Added proper element focus and caret destination for keyboard users activating a fragment URL
- Increased disk cache capacity when there is lots of free space
- Prevented hangs during synchronous XHR requests if a network session doesn't exist
- Fixed the response for a POST request on a blob resource to return a "network error" instead of HTTP 500 response
- Restricted HTTP/0.9 responses to default ports and cancelled HTTP/0.9 resource loads if the document was loaded with another HTTP protocol
- Fixed parsing URLs containing tabs or newlines
- Fixed cookie validation in private browsing
- Provided memory cache support for the Vary header
If you're a developer interested in experimenting with new changes to the browser before they hit the general release, you can download the latest release directly from Apple.
