--- title: Safari Technology Preview 220 Release Notes framework: safari-technology-preview-release-notes role: article role_heading: Article path: safari-technology-preview-release-notes/stp-release-220 --- # Safari Technology Preview 220 Release Notes Learn about the latest web technology updates in Safari Technology Preview: CSS, DOM, JavaScript, Media, Rendering, Web Animations, Web API, Web Inspector, and WebRTC. ## Overview Overview Safari Technology Preview Release 220 is now available for download for macOS Sequoia 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: 294488@main…295070@main CSS New Features Added support for field-sizing to override the default sizing behavior of form elements and adjust size to fit their contents. (295370@main) (151949208) Resolved Issues Fixed grid sizing with inline-size containment and auto-fit columns is incorrectly sized. (295023@main) (108897961) Fixed a bug where an anchor-positioned element does not properly render when it’s initially hidden from view, then shown. (294924@main) (148608785) DOM Resolved Issues Fixed the serialization of CDATASection nodes in HTML. (294547@main) (150739105) JavaScript New Features Added support for @@dispose and @@asyncDispose from the Explicit Resource Management Proposal behind runtime flag. (294592@main) (150816114) Added support for SuppressedError from the Explicit Resource Management Proposal behind runtime flag. (294774@main) (151132111) Added support for DisposableStack constructor from the Explicit Resource Management Proposal behind runtime flag. (294880@main) (151280591) Media Resolved Issues Fixed MediaSession to handle SVG icons with subresources. (294499@main) (150665852) Fixed MediaCapabilitiesDecodingInfo.configuration to be correctly populated even when .supported is false. (294957@main) (150680756) Rendering Resolved Issues Fixed invisible