---
title: Safari Technology Preview 221 Release Notes
framework: safari-technology-preview-release-notes
role: article
role_heading: Article
path: safari-technology-preview-release-notes/stp-release-221
---

# Safari Technology Preview 221 Release Notes

Learn about the latest web technology updates in Safari Technology Preview: Accessibility, Forms, JavaScript, Media, PDF, Rendering, Web API, Web Inspector, and WebRTC.

## Overview

Overview Safari Technology Preview Release 221 is now available for download for macOS Tahoe and macOS Sequoia. 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: 295071@main…295660@main Accessibility Resolved Issues Fixed aria-expanded attribute support on navigation links. (295356@main)  (141163086) Forms Resolved Issues Fixed updating scrollbar appearance correctly for the page and <textarea> elements. (295590@main)  (151496190) Fixed programmatically assigned File objects to display the correct filename in <input> elements, even without a file path. (295458@main)  (152048377) JavaScript Resolved Issues Fixed nested negated classes resulting in incorrect matches. (295277@main)  (151000852) Media Resolved Issues Fixed MP4 seeking with b-frames to prevent out-of-order frame display by suppressing frames with earlier presentation timestamps following the seek point. (295304@main)  (140415210) PDF Resolved Issues Fixed “Open with Preview” button to open a PDF in the Preview app. (295475@main)  (148680145) Rendering Resolved Issues Fixed an issue causing a <canvas> element to disappear for one frame if a view transition occurs. (295467@main)  (149709642) Web API Resolved Issues Fixed escaping < and > when serializing HTML attribute values. (295149@main)  (150520333) Web Inspector New Features Added support for recording Workers in the Timelines tab. (295485@main)  (151721737) Resolved Issues Fixed pretty-printing CSS to avoid adding a space after the universal selector (*) when followed by a pseudo-class or pseudo-element, preventing unintended changes to CSS selector behavior. (295447@main)  (71544976) (FB8906066) WebRTC New Features Added support for exposing a default system speaker device. (295206@main)  (151761469)

## See Also

### 2025

- [Safari Technology Preview 234 Release Notes](safari-technology-preview-release-notes/stp-release-234.md)
- [Safari Technology Preview 233 Release Notes](safari-technology-preview-release-notes/stp-release-233.md)
- [Safari Technology Preview 232 Release Notes](safari-technology-preview-release-notes/stp-release-232.md)
- [Safari Technology Preview 231 Release Notes](safari-technology-preview-release-notes/stp-release-231.md)
- [Safari Technology Preview 230 Release Notes](safari-technology-preview-release-notes/stp-release-230.md)
- [Safari Technology Preview 229 Release Notes](safari-technology-preview-release-notes/stp-release-229.md)
- [Safari Technology Preview 228 Release Notes](safari-technology-preview-release-notes/stp-release-228.md)
- [Safari Technology Preview 227 Release Notes](safari-technology-preview-release-notes/stp-release-227.md)
- [Safari Technology Preview 226 Release Notes](safari-technology-preview-release-notes/stp-release-226.md)
- [Safari Technology Preview 225 Release Notes](safari-technology-preview-release-notes/stp-release-225.md)
- [Safari Technology Preview 224 Release Notes](safari-technology-preview-release-notes/stp-release-224.md)
- [Safari Technology Preview 223 Release Notes](safari-technology-preview-release-notes/stp-release-223.md)
- [Safari Technology Preview 222 Release Notes](safari-technology-preview-release-notes/stp-release-222.md)
- [Safari Technology Preview 220 Release Notes](safari-technology-preview-release-notes/stp-release-220.md)
- [Safari Technology Preview 219 Release Notes](safari-technology-preview-release-notes/stp-release-219.md)