---
title: Safari Technology Preview 200 Release Notes
framework: safari-technology-preview-release-notes
role: article
role_heading: Article
path: safari-technology-preview-release-notes/stp-release-200
---

# Safari Technology Preview 200 Release Notes

Learn about the latest web technology updates in Safari Technology Preview: CSS, JavaScript, Rendering, and Web Extensions.

## Overview

Overview Safari Technology Preview Release 200 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: 280675@main…281143@main. CSS Resolved Issues Fixed: Optimized Masonry Grids for items with a span of 1. (280919@main)  (131407028) JavaScript New Features Implemented Uint8Array.prototype.toHex in SIMD. (280719@main)  (131249821) Resolved Issues Fixed class field initializers to disallow yield and await expressions. (280837@main)  (119044881) Fixed DestructuringAssignmentTarget to be evaluated prior to calling [[Get]] or a stepping iterator. (281013@main)  (121960976) Fixed throwing an exception for negative exponent in BigInt in the JIT compiler. (280841@main)  (131051084) Fixed RegExp range quantifier to allow 2^53 - 1. (280953@main)  (131710011) Rendering Resolved Issues Fixed garbled bold text caused by glyph lookup using the wrong font’s glyph IDs when multiple installed fonts have the same name. (281022@main)  (129891005) (FB13909556) Fixed scrolling of content overflowing a flex item in an end-aligned flex container. (279992@main)  (131201271) Web Extensions Resolved Issues Fixed Service Workers not appearing in the Develop menu or remote Web Inspector menu. (280912@main)  (130712941)

## 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 203 Release Notes](safari-technology-preview-release-notes/stp-release-203.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 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)