--- title: Release Notes for Safari Technology Preview 242 | daily.dev description: Safari Technology Preview 242 is now available for macOS Tahoe and macOS Sequoia. Key additions include CSS attr() function from CSS Values Level 5,... canonical: https://daily.dev/posts/release-notes-for-safari-technology-preview-242-wqe05apwl twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Release Notes for Safari Technology Preview 242 | daily.dev og:description: Safari Technology Preview 242 is now available for macOS Tahoe and macOS Sequoia. Key additions include CSS attr() function from CSS Values Level 5,... og:url: https://daily.dev/posts/release-notes-for-safari-technology-preview-242-wqe05apwl og:image: https://api.daily.dev/og/posts/wQE05aPWl.png og:image:alt: Release Notes for Safari Technology Preview 242 og:image:width: 1200 og:image:height: 630 og:locale: 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 242 **[WebKit](https://daily.dev/sources/webkit)** · 6 min read · 3 upvotes · 0 comments ## Summary Safari Technology Preview 242 is now available for macOS Tahoe and macOS Sequoia. Key additions include CSS attr() function from CSS Values Level 5, oblique-only value for font-synthesis-style, closedby attribute on dialog elements, SVG lang/xml:lang attribute support, getAllRecords() and IDBGetAllOptions in IndexedDB, RTCRtpReceiver.jitterBufferTarget, and secure cookies on loopback hosts. Numerous bug fixes span CSS layout (anchor positioning, sticky elements, flexbox regressions), JavaScript engine correctness, HTML parser edge cases, SVG animations, scrolling behavior, WebRTC encoding, and Web API correctness including URL parsing and event listener flag preservation. ## Full article daily.dev links to this article rather than hosting it. 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