--- title: Safari Technology Preview 203 Release Notes framework: safari-technology-preview-release-notes role: article role_heading: Article path: safari-technology-preview-release-notes/stp-release-203 --- # Safari Technology Preview 203 Release Notes Learn about the latest web technology updates in Safari Technology Preview: Accessibility, Canvas, CSS, Editing, JavaScript, Media, Networking, Rendering, SVG, Web API, Web Apps, Web Assembly, Web Extensions, and Web Inspector. ## Overview 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: contents on tbody elements preventing table rows from being properly exposed in the accessibility tree. (282413@main) (129131780) Fixed the handling of ElementInternals.ariaValueNow null values so the right value is exposed to assistive technologies. (282422@main) (129218234) Fixed updating the accessibility tree when text underneath an aria-describedby element changes. (282430@main) (131877635) Canvas Resolved Issues Fixed CanvasRenderingContext2D globalAlpha property getting ignored for some values of globalCompositeOperation. (282995@main) (134840885) CSS New Features Added support for scrollbar-gutter. (282662@main) (111918434) Added support for cursor in ::marker. (282642@main) (133256523) Added support for ruby-overhang. (283012@main) (135058411) Resolved Issues Fixed text-underline-offset to 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 autocorrect attribute, 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 element inserting the text after the element instead. (282825@main) (134378236) JavaScript New Features Added support for Iterator.prototype.constructor and Iterator.prototype[@@toStringTag]. (282687@main) (134598491) Added support for Iterator.from from Iterator Helpers Proposal. (283016@main) (135065388) Resolved Issues Fixed: Disallow yield and await expressions in class field initializers. (282819@main) (132338331) Fixed Object.keys(global) including non-enumerable properties unless deleted first. (282554@main) (134121649) Fixed the error message of Temporal.Instant.fromEpochMilliseconds. (282587@main) (134454596) Fixed duration format’s nanoseconds calculation ordering. (282690@main) (134526619) Fixed TimeZoneAnnotation to disallow sub-minute. (282710@main) (134541964) Fixed: Temporal.Instant.prototype.epochMilliseconds to return a floored value. (282718@main) (134666158) Deprecations Remove obsoleted Temporal.Instant API. (282400@main) (134195010) 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-Policy header fields in the response of iframes were not ignored, resulting in window.opener being null after multiple cross-origin navigations of the main frame. (282482@main) (132840366) 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 getPointAtLength to throw an exception when path is empty. (282665@main) (122574451) Web API Resolved Issues Fixed: Changed click, auxclick, contextmenu, and click() to use PointerEvent. (282524@main) (71202646) Fixed: Aligned oncuechange event handler handling with other event handlers. (282977@main) (98254058) Fixed popovertarget to work on buttons in a form. (282801@main) (131042177) Fixed XMLSerializer.serializeToString() not serializing the children of and also not closing the if it has children. (282725@main) (133404338) Fixed: Moved onbeforeinput to GlobalEventHandlers. (282912@main) (134943272) Web Apps New Features Parse dir member 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_call_ref. (282853@main) (134442713) Web Extensions Resolved Issues Fixed Safari Web Extension ports to receive messages in content scripts when sent from the onConnect event listener. (283006@main) (133501214) (FB14721836) Web Inspector New Features Added support for sourcemaps to be blackboxed. (282740@main) (133731737) Added support for showing boundThis for arrow functions in the console. (282553@main) (134268331) ## See Also ### 2024 - [Safari Technology Preview 210 Release Notes](safari-technology-preview-release-notes/stp-release-210.md) - [Safari Technology Preview 209 Release Notes](safari-technology-preview-release-notes/stp-release-209.md) - [Safari Technology Preview 208 Release Notes](safari-technology-preview-release-notes/stp-release-208.md) - [Safari Technology Preview 207 Release Notes](safari-technology-preview-release-notes/stp-release-207.md) - [Safari Technology Preview 206 Release Notes](safari-technology-preview-release-notes/stp-release-206.md) - [Safari Technology Preview 205 Release Notes](safari-technology-preview-release-notes/stp-release-205.md) - [Safari Technology Preview 204 Release Notes](safari-technology-preview-release-notes/stp-release-204.md) - [Safari Technology Preview 202 Release Notes](safari-technology-preview-release-notes/stp-release-202.md) - [Safari Technology Preview 201 Release Notes](safari-technology-preview-release-notes/stp-release-201.md) - [Safari Technology Preview 200 Release Notes](safari-technology-preview-release-notes/stp-release-200.md) - [Safari Technology Preview 199 Release Notes](safari-technology-preview-release-notes/stp-release-199.md) - [Safari Technology Preview 198 Release Notes](safari-technology-preview-release-notes/stp-release-198.md) - [Safari Technology Preview 197 Release Notes](safari-technology-preview-release-notes/stp-release-197.md) - [Safari Technology Preview 196 Release Notes](safari-technology-preview-release-notes/stp-release-196.md) - [Safari Technology Preview 195 Release Notes](safari-technology-preview-release-notes/stp-release-195.md)