---
title: Safari Technology Preview 233 Release Notes
framework: safari-technology-preview-release-notes
role: article
role_heading: Article
path: safari-technology-preview-release-notes/stp-release-233
---

# Safari Technology Preview 233 Release Notes

Learn about the latest web technology updates in Safari Technology Preview: Animations, HTML, MathML, Rendering, Web API, and Web Inspector.

## Overview

Overview Safari Technology Preview Release 233 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: 302450@main…303091@main. Animations Resolved Issues Fixed incorrect overlap calculations for transform animations including translate, scale, and rotate properties. (303045@main)  (88383253) HTML New Features Added support for enhanced HTML select parsing to allow <select> elements to include <optgroup>, <option>, and <hr> at deeper nesting levels. (302480@main)  (163927485) MathML New Features Added support for the MathML scriptlevel attribute, mapping it to CSS math-depth as a presentational hint. (302841@main)  (164469677) Resolved Issues Fixed mpadded elements in RTL (dir="rtl") to respect lspace. (303070@main)  (164740784) Rendering Resolved Issues Fixed an issue where fixed positioned elements were not rendered correctly in right-to-left pages using the vertical-rl writing mode. (302542@main)  (161712734) Web API New Features Added support for reading Blob.stream() with a BYOB (getReader({mode:'byob'})) reader. ( 302787@main )  (164307723) Resolved Issues Fixed Trusted Types to correctly send CSP violation reports when a default policy returns an invalid javascript: URL or throws an exception. (302543@main)  (160960418) Fixed NavigateEvent to correctly fire an AbortSignal when a navigation is aborted. (302591@main)  (163957784) Fixed NavigateEvent.sourceElement to correctly reference elements from different browsing contexts. (302504@main)  (163962362) Web Inspector New Features Added support for capturing console.screenshot images within a Worker, including handling of ImageData, ImageBitmap, OffscreenCanvas, various CanvasRenderingContext types, and valid base64 data: URLs. (302778@main)  (98223234)

## See Also

### 2025

- [Safari Technology Preview 234 Release Notes](safari-technology-preview-release-notes/stp-release-234.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 221 Release Notes](safari-technology-preview-release-notes/stp-release-221.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)