Apple has released Safari Technology Preview 203, the latest version of their developer preview web browser. The preview version of Apple’s popular browser offers developers and other interested users the ability to try out features that may or may not, debut in future public release versions of Safari.
Safari Technology Preview 203 includes fixes and updates for Accessibility, Canvas, CSS, Editing, JavaScript, Media, Networking, Rendering, SVG, Web Apps, Web Assembly, Web Extensions, and Web Inspector.
The current Safari Technology Preview release is compatible with machines macOS Sonoma and the macOS Sequoia beta, the newest version of macOS that is currently in beta testing.
Overview
Safari Technology Preview Release 203 is now available for download for macOS Sequoia beta and macOS Sonoma. If you already have Safari Technology Preview installed, you can update it in System Settings under General → Software Update.
This release includes WebKit changes between: 282390@main…283042@main.
Accessibility
Resolved Issues
- Fixed
display: contentsontbodyelements preventing table rows from being properly exposed in the accessibility tree. (282413@main) (129131780)- Fixed the handling of
Elementnull values so the right value is exposed to assistive technologies. (282422@main) (129218234)Internals .aria Value Now - Fixed updating the accessibility tree when text underneath an
aria-describedbyelement changes. (282430@main) (131877635)Canvas
Resolved Issues
- Fixed CanvasRenderingContext2D
globalproperty getting ignored for some values ofAlpha global. (282995@main) (134840885)Composite Operation CSS
New Features
- Added support for
scrollbar-gutter. (282662@main) (111918434)- Added support for
cursorin::. (282642@main) (133256523)marker - Added support for
ruby-overhang. (283012@main) (135058411)Resolved Issues
- Fixed
text-underline-offsetto support percentages. (282611@main) (117246233)- Fixed: Updated
calc()to the most recent web standard, including support for dividing by numbers with additional units. (282580@main) (134446246)Editing
Resolved Issues
- Fixed aligning with the standardized version of the
autocorrectattribute, which does not support Email, URL, and Password fields and does not treat the empty string value in a special way. (282792@main) (101036922)- Fixed inserting text before a
<picture>element inserting the text after the element instead. (282825@main) (134378236)JavaScript
New Features
- Added support for
Iteratorand.prototype .constructor Iterator. (282687@main) (134598491).prototype[@@to String Tag] - Added support for
Iteratorfrom Iterator Helpers Proposal. (283016@main) (135065388).from Resolved Issues
- Fixed: Disallow
yieldandawaitexpressions in class field initializers. (282819@main) (132338331)- Fixed
Objectincluding non-enumerable properties unless deleted first. (282554@main) (134121649).keys(global) - Fixed the error message of
Temporal. (282587@main) (134454596).Instant .from Epoch Milliseconds - Fixed duration format’s nanoseconds calculation ordering. (282690@main) (134526619)
- Fixed TimeZoneAnnotation to disallow sub-minute. (282710@main) (134541964)
- Fixed:
Temporalto return a floored value. (282718@main) (134666158).Instant .prototype .epoch Milliseconds Deprecations
- Remove obsoleted
TemporalAPI. (282400@main) (134195010).Instant Media
New Features
- Added support for allowing websites to override the system-default accessibility caption styling. (282568@main) (134265139)
Resolved Issues
- Fixed a bug in WebCodecs where audio and video codecs with pending work could be prematurely garbage collected. (282657@main) (134297589)
Networking
Resolved Issues
- Fixed a bug where
Cross-Origin-Opener-Policyheader fields in the response of iframes were not ignored, resulting inwindowbeing null after multiple cross-origin navigations of the main frame. (282482@main) (132840366).opener Rendering
Resolved Issues
- Fixed items that span multiple tracks with optimizations. (282464@main) (132435056)
- Fixed rendering tick marks of the range input type when the page zoom is less than 1. (282451@main) (134282707)
SVG
Resolved Issues
- Fixed an issue for
getto throw an exception whenPoint At Length pathis empty. (282665@main) (122574451)Web API
Resolved Issues
- Fixed: Changed
click,auxclick,contextmenu, andclick()to use PointerEvent. (282524@main) (71202646)- Fixed: Aligned
oncuechangeevent handler handling with other event handlers. (282977@main) (98254058)- Fixed
popovertargetto work on buttons in a form. (282801@main) (131042177)- Fixed
XMLSerializernot serializing the children of.serialize To String() <img>and also not closing the<img>if it has children. (282725@main) (133404338)- Fixed: Moved
onbeforeinputtoGlobal. (282912@main) (134943272)Event Handlers Web Apps
New Features
- Parse
dirmember of Web Application Manifest. (282761@main) (131900106)Resolved Issues
- Fixed Web Application Manifest parsing to trim all ASCII whitespace. (282544@main) (134336817)
Web Assembly
New Features
- Added support for
return. (282853@main) (134442713)_call _ref Web Extensions
Resolved Issues
- Fixed Safari Web Extension ports to receive messages in content scripts when sent from the
onevent listener. (283006@main) (133501214) (FB14721836)Connect Web Inspector
New Features
- Added support for sourcemaps to be blackboxed. (282740@main) (133731737)
- Added support for showing
boundfor arrow functions in the console. (282553@main) (134268331)This
While the preview is intended for use by developers and advanced users, to provide Apple with feedback on the development of the Safari browser, it can be run side-by-side with the release version of Safari. The app doesn’t require a developer account to download and install. For more information, visit the Safari Technology Preview website.
