Release Notes for Safari Technology Preview 122 | WebKit

Release Notes for Safari Technology Preview 122 | WebKit
Release Notes for Safari Technology Preview 122
Mar 11, 2021
by
Jon Davis
Safari Technology Preview
Release 122 is now
available for download
for macOS Big Sur and macOS Catalina. If you already have Safari Technology Preview installed, you can update in the Software Update pane of System Preferences on macOS.
This release covers WebKit revisions
272845-273903
Web Inspector
Elements Tab
Added badges for CSS Grid container elements (
r273097
Layout details sidebar panel
Implemented grid overlay options (
r272918
r272948
r273098
r273155
r273164
r273185
r273847
Show a list of CSS Grid container elements in the Layout sidebar panel (
r272934
r272976
r273502
Audits Tab
Fixed clicking the “Start” button in the content area placeholder text (
r273900
Animations
Changed CSS properties that disallow negative values to not animate to negative values (
r273001
Changed blending of
border-image-width
to be discrete between
auto
values and other types (
r273635
Fixed
border-image-outset
to handle float values (
r273478
Fixed
border-image-slice
blending to account for the
fill
keyword (
r273625
CSS
Changed
min-content
and
max-content
keywords to behave as an initial value in block axis (
r273206
Changed CSS grid to not allow negative heights (
r273470
Fixed min- and max- widths of grid affected by ancestor (
r273435
Changed the initial value for
border-image-outset
to 0 (
r273882
Implemented
:focus-visible
r273812
r272983
Implemented the first case in Definite and Indefinite Sizes specifications in section 9.8 for flexbox (
r273072
Fixed runtime-disabled CSS features still appearing enabled via
CSS.supports()
r273385
Removed support in the CSS parser for
-khtml-
prefixed CSS values (
r273637
Removed support for
pos
and
pixel
prefixed CSS values (
r273627
CSS Color
Added experimental support for CSS Color 5
color-contrast()
r273683
Added experimental support for CSS Color 5
color-mix()
r273244
Added experimental support for CSS Color 5 Relative Color Syntax (
r273127
Changed
color(lab ...)
to serialize as
color(lab ...)
not
lab()
according to latest CSS Color 4 spec (
r273211
Fixed
lab()
and
lch()
colors to clamp out-of-bound values at parse time (
r272909
Fixed
lch()
colors to serialize as
lch()
r273078
CSS Aspect Ratio
Added support for
aspect-ratio
on flexbox items (
r273193
Changed an
aspect-ratio
that ends with forward slash to be treated as invalid (
r273068
Fixed
aspect-ratio
showing in computed styles when disabled (
r273314
Changed to take
box-sizing
into account in replaced element intrinsic sizing for
aspect-ratio
r273753
JavaScript
Enabled private methods (
r273125
Implemented private static methods (
r273107
Implemented top-level-await (
r273225
Implemented RegExp Match Indices (
r273086
Implemented GC verifier (
r273138
Added support for modules in Workers and Worklets (
r273203
Added support for modules in Service Workers (
r273224
Avoided performing
toObject
for options in new Intl constructors to align them to a new spec change (
r273153
Reduced promise reaction memory usage when there are multiple reactions (
r273718
Optimized object-reset expression (
r273135
Optimized
Promise#then
by avoiding function allocations in major case (
r273605
Micro-optimized
for-in
r273766
Threw TypeError when
getFunctionRealm
hits revoked Proxy (
r273661
Threw TypeError when TypedArray’s
[[DefineOwnProperty]]
failed (
r273750
Fixed
delete
with index for module namespace object when arbitrary module identifiers use index (
r273816
WebAssembly
Extended wasm type with type index (
r273813
Implemented non-trapping float to int conversion (
r272933
Web API
Enabled Paint Timing (
r273221
r273220
Changed window proxy of detached iframe doesn’t respect updates to global values (
r273901
Fixed devicemotion and deviceorientation events to work in third-party iframes with
Feature-Policy
allowing it (
r273444
Media
Fixed media segment getting incorrectly dropped when using negative
timestampOffset
or when source buffer appendWindow is set in MSE (
r273461
Fixed audio that stops playing when backgrounding a page that is playing and capturing audio (
r273069
WebRTC
Added support for WebRTC priority (
r273550
Fixed
MediaRecorder.stop()
to work correctly when recording has been paused (
r272911
Added support for BigInt as media-stream encryption key (
r273158
Added the ability for an embedded accessibility image description in an image file to be reported if available (
r273214
Fixed VoiceOver announces grid as having “0 columns” causing VoiceOver to not enter the grid (
r273715
Fixed VoiceOver incorrectly announcing groups in ARIA tree instances as empty (
r273328
Scrolling
Fixed scroll snapping when dragging scrollbars (
r273690
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