Apple releases preview of Safari 143 technology [Download]

Apple has released Safari Technology Preview 143 for macOS Monterey and macOS Big Sur.

Safari Technology Preview provides a preview of web technologies coming to macOS and iOS and lets you experiment with these technologies in your websites and extensions.

Note: Tab groups are not synced in this release.

Web Inspector
● Elements tab
○ Added an option in the Layout panel of the Details sidebar for Flexbox overlays to display the CSS order and/or DOM index of each element in the parent flex container (r290613)
● Service technicians are no longer fired while being inspected. (r291467)

CSS container queries
● Added support for nested container queries (r290257)
● Added basic support for container units (r291474)
● Changed to apply online size containment only when allowed (r291154)
● Ensure container style changes are propagated to descendants (r291500)
● Fixed getComputedStyle to update style of invalid query containers (r290320)
● Fixed offsetWidth, offsetHeight and similar to update layout of container requests (r290380)
● Implemented a new container selection algorithm (r291098)

CSS Cascading Layers
● Added return support in @keyframes (r290457)
● Added return layer support in @keyframes (r290729)
● Fixed return on low priority properties (r291260)
● Leave revert-layer in the lowest layer revert to user styles (r290864)

● Fixed correct containing block replacement size calculation for elements that are undergrid in one dimension (r290577)
● Grid direction converted to be relative to subgrid when considering extra margin (r290576)
● Handle reverse flow direction when converting iterator coordinates for a subnet (r290572)
● Fixed subgrid elements must always be stretched (r291464)
● Fixed Position Positioning: Absolute Elements in Nested Grids (r290674)

● Implemented text decoration as a shortcut (r290756, r291244)
● Implemented logical properties for CSS overscroll-behavior (r290422)
● Fixed background clip: text to use with display: flex (r291303)

● Added CalendarDateTime analysis (r290248)
● Fixed ShadowRealm scrolling (r290283)
● Fixed Temporal.PlainDate to validate the input range (r290282)

● Fixed image alt text bidirectional reordering (r290734)
● Fixed position of alt text in right-to-left context (r290726)
● Fixed table sizing when colgroup comes after tbody (r290512)
● Fixed scrollbars disappearing when very long or wide (r290545)
● Management of blocks containing perpendiculars when calculating the available logical height (r290634)

Web Animations
● Added support for passing an optional timeline to Element.animate() (r290655)
● Changed the definition of the composite property on a keyframe effect to invalidate the target style (r290741)
● Fixed inheritance values ​​should trigger keyframe recalculation if a previous effect changed this property (r290831)
● Fixed keyframe values ​​set to inherit to recalculate their values ​​when the inherited value changes (r290823)
● Fixed fill and stroke animation to or from currentColor (r290898)
● Fixed ::placeholder to not be a valid pseudo-element for a keyframe effect target (r290662)
● Fixed animations on modal and ::backdrop dialog items to run more than once (r291282)
● Fixed outline width with transition to animate correctly (r290735)
● Fixed text highlight hotkey to be able to animate it (r290895)
● Fixed text accent color to support non-discrete animations (r290887)
● Changes to font size recalculation keyframes (r290730)
● Added discrete animation support for:
○ background blending mode (r291041)
○ clip-ruler (r291042)
○ color interpolation (r291008)
○ color interpolation filters (r291043)
○ counter-increment (r291090)
○ counter reset (r291099)
○ dominant baseline (r291068)
○ fill rule (r291100)
○ font family (r291040)
○ font feature settings (r291039)
○ font kerning (r291037)
○ font-synthesis (r291103)
○ font-variant-alternates (r291104)
○ font-variant-caps (r291119)
○ east-asian-variant-font (r291109)
○ font-variant-ligatures (r291114)
○ numeric-variant-font (r291147)
○ font-variant-position (r291115)
○ grid pattern areas (r291122)
○ newline (r290885)
○ end marker (r291226)
○ marker-middle (r291227)
○ marker start (r291228)
○ mask clip (r291130)
○ mask-composite (r291159)
○ mask mode (r291160)
○ origin-mask (r291148)
○ pattern repeat (r291161)
○ type mask (r291158)
○ quotes (r291128)
○ scrolling behavior (r291129)
○ shape rendering (r291171)
○ racing line cap (r291163)
○ dash-join (r291164)
○ text anchor (r291166)
○ text-decoration-skip-ink (r290886)
○ text emphasis style (r290888)
○ text rendering (r291157)
○ vector effect (r291170)

● Fixed fixed animated values ​​in the range 0-1 for:
○ fill opacity (r290568)
○ flood opacity (r290571)
○ stop-opacity (r290569)
○ stroke opacity (r290570)

● History swipe allowed in scroll with overscroll behavior (r291497)
● Fixed incorrect painting when scrolling a page with fixed backgrounds (r290785)
● Fixed scrolling animation when navigating with keyboard (r290548, r290625)
● Fixed element with position: sticky after pasting, starting to move incorrectly when scrolling (r290812)

● Added support for AuthenticatorSelection.residentKey (r291176)
● Added fallback to attestation=none if requested but not available for platform authenticator (r290539)
● Enabled using WebAuthn in cross-origin iframe elements (r291018)
● Improved virtual authenticator support ( r291423 , r291321)

● Fixed WebGL rendering incorrect results when using preserveDrawingBuffer (r291218)

● Enabled inert attribute by default (r290587)

Web APIs
● Enabled API Permissions by default (r291116, r290301)
● Fixed double triggering of mouse move events in Safari (r290743)
● Fixed rendering when loading a USDZ as main resource (r290562)
● Fixed CORS preflight failure due to cache check header (r290507)
● Fixed PerformanceNavigationTiming response start unavailability when using Service Worker cache (r291441)
● Fixed buffered flag not working in Paint Timing (r290247)
● Fixed load event never firing after form submission (r290841)
● Fixed WebSocket.send() to synchronously update bufferedAmount (r290995)
● Creation of the UA phantom tree of the input element has been made lazy (r290284)
● Pointer event checks for SVG take into account inert subtrees (r290306)
● Removed 1 ms minimum for setTimeout (r291476)

● AudioContext will continue to play when minimizing or moving the macOS Safari window in the background (r291267)
● Fixed garbled output for some WebM videos with VP8 codec (r291216)
● Implemented remote inbound RTP packet loss (r290865)

● Updated WebSpeech API support (r291124)

File system access
● Changed to throw an exception if a file or directory is not accessible in the filesystem (r291014)
● Empty name not allowed in FileSystemHandle (r290998)
● Forbidden names that are not allowed by the underlying file system (r291057)
● Fixed website data fetching which could lead to wrong or missing record after migrating data to general storage directory (r290239, r290233)

Web extensions
● Fixed cookie expiration dates so that they are not shifted by 30 years

You can download Safari Technology Preview 143 from the link below…

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