---
title: "Release Notes for Safari Technology Preview 245"
url: https://daily.dev/posts/release-notes-for-safari-technology-preview-245-wdz0ycsqg
source_url: https://webkit.org/blog/17970/release-notes-for-safari-technology-preview-245
type: article
source: "WebKit"
published: 2026-06-08T22:22:37.433Z
updated: 2026-06-08T22:22:59.371Z
tags: ["javascript", "css", "safari"]
reading_time: 7
upvotes: 4
comments: 0
language: en
---

> ## Documentation Index
> Fetch the complete documentation index at: https://daily.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Release Notes for Safari Technology Preview 245

**[WebKit](https://daily.dev/sources/webkit)** · 7 min read · 4 upvotes · 0 comments

## Summary

Safari Technology Preview 245 is available for macOS Tahoe and Sequoia. Key highlights include new CSS features (case-sensitive modifier `s` in attribute selectors, `:host:has()` compound selector support), JavaScript static `import defer` semantics, and MathML operator dictionary improvements. The release fixes numerous CSS layout bugs involving `aspect-ratio`, flex containers, and `:has()` selector performance. Other fixes address HTML performance regressions for dynamic `<img>` insertion, WebRTC screen sharing quality issues, rendering bugs with `filter: blur()` and `drop-shadow`, SVG rendering issues, and Web Extensions compatibility problems including Cloudflare bot challenge pages.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://webkit.org/blog/17970/release-notes-for-safari-technology-preview-245>

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---

Tags: [#javascript](https://daily.dev/tags/javascript), [#css](https://daily.dev/tags/css), [#safari](https://daily.dev/tags/safari)

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