--- title: Release Notes for Safari Technology Preview 249 | daily.dev description: Safari Technology Preview 249 brings a large set of new CSS features including `@function` custom functions, `if()`, `calc-mix()`, `attr()`, `wrap-inside`,... canonical: https://daily.dev/posts/release-notes-for-safari-technology-preview-249-zoqat554b twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Release Notes for Safari Technology Preview 249 | daily.dev og:description: Safari Technology Preview 249 brings a large set of new CSS features including `@function` custom functions, `if()`, `calc-mix()`, `attr()`, `wrap-inside`,... og:url: https://daily.dev/posts/release-notes-for-safari-technology-preview-249-zoqat554b og:image: https://api.daily.dev/og/posts/ZOqaT554B.png og:image:alt: Release Notes for Safari Technology Preview 249 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 249 **[WebKit](https://daily.dev/sources/webkit)** · 7 min read · 4 upvotes · 0 comments ## Summary Safari Technology Preview 249 brings a large set of new CSS features including `@function` custom functions, `if()`, `calc-mix()`, `attr()`, `wrap-inside`, `white-space-trim`, `text-decoration-inset`, `justify-self` on block-level boxes, and `outline-offset: inset`. JavaScript gains the `Temporal` object enabled by default. Web API additions include WebGPU subgroup support, close watchers with the `closedby` attribute for dialogs, and WebDriver support for the Digital Credentials API. Numerous bug fixes span CSS Grid layout, scroll-driven animations, accessibility (VoiceOver, aria-labelledby), Web Inspector tooling, WebAssembly error stacks, and WebRTC spec compliance. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Release Notes for Safari Technology Preview 248](https://daily.dev/posts/release-notes-for-safari-technology-preview-248-dthfa5tpa) · WebKit · 2 upvotes · 0 comments - [Release Notes for Safari Technology Preview 244](https://daily.dev/posts/release-notes-for-safari-technology-preview-244-aqbh7pydl) · WebKit · 10 upvotes · 1 comments - [Release Notes for Safari Technology Preview 246](https://daily.dev/posts/release-notes-for-safari-technology-preview-246-r9ttzifqi) · WebKit · 1 upvotes · 0 comments - [Release Notes for Safari Technology Preview 228](https://daily.dev/posts/release-notes-for-safari-technology-preview-228-wckdr6spg) · WebKit · 0 upvotes · 0 comments - [Release Notes for Safari Technology Preview 247](https://daily.dev/posts/release-notes-for-safari-technology-preview-247-nh5hym0xi) · WebKit · 2 upvotes · 1 comments --- Tags: [#javascript](https://daily.dev/tags/javascript), [#css](https://daily.dev/tags/css), [#safari](https://daily.dev/tags/safari) [View this post on daily.dev](https://daily.dev/posts/release-notes-for-safari-technology-preview-249-zoqat554b) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Release Notes for Safari Technology Preview 249","url":"https://daily.dev/posts/release-notes-for-safari-technology-preview-249-zoqat554b","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/release-notes-for-safari-technology-preview-249-zoqat554b"},"datePublished":"2026-07-29T21:55:17.864Z","dateModified":"2026-07-29T22:00:43.695Z","description":"Safari Technology Preview 249 brings a large set of new CSS features including `@function` custom functions, `if()`, `calc-mix()`, `attr()`, `wrap-inside`,...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/ba76a72d9d317eb6673f7c7908f4afbb?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/ba76a72d9d317eb6673f7c7908f4afbb?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"WebKit","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"WebKit","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/webkit","url":"https://daily.dev/sources/webkit"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/release-notes-for-safari-technology-preview-249-zoqat554b","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":4},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"javascript,css,safari","timeRequired":"PT7M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"WebKit","item":"https://daily.dev/sources/webkit"},{"@type":"ListItem","position":3,"name":"Release Notes for Safari Technology Preview 249"}]} ```